4.5 Review

Mechanochemical synthesis of organohalogen compounds: a synthetic chemist's view

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Safety Considerations and Proposed Workflow for Laboratory-Scale Chemical Synthesis by Ball Milling

Ian Priestley et al.

Summary: Chemical reactions in a ball mill and without a bulk reaction solvent have different safety profiles compared to stirred solution reactions. We present and describe steps for researchers to consider the hazards and measures to minimize risks to themselves and their colleagues.

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Valentina Martinez et al.

Summary: Mechanochemical processing is an efficient and unique tool for the synthesis and transformation of various materials. Recent advancements combine mechanochemical reactivity with other energy sources, achieving reactions not possible with traditional methods. Thermo-mechanochemistry, sono-mechanochemistry, electro-mechanochemistry, and photo-mechanochemistry represent significant advances in modern mechanochemistry, introducing a new level of solid-state reactivity.

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Review Chemistry, Multidisciplinary

The Rise of Trichlorides Enabling an Improved Chlorine Technology

Merlin Kleoff et al.

Summary: Chlorine plays a vital role in the industrial production of global materials. Recent research has shown that polychlorides have immense industrial potential and can be used for chlorine storage and chlorination reactions. The ionic liquid [NEt3Me][Cl-3] offers similar reactivity to chlorine gas but with a better safety profile, making it an ideal candidate for chlorine storage. Furthermore, [NEt3Me][Cl-3] can be directly used as a chlorination reagent for downstream processes, leading to a more practical and safer chlorine industry.

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Review Chemistry, Multidisciplinary

4′-Fluoro-nucleosides and nucleotides: from nucleocidin to an emerging class of therapeutics

Phillip T. Lowe et al.

Summary: This review discusses the history and development of 4'-fluoro-nucleosides, tracing their origin from the discovery of the rare fluorine-containing natural product nucleocidin. Nucleocidin, which contains a fluorine atom at the 4'-position of its ribose ring, has played an important role in inspiring the exploration of 4'-fluoro-nucleosides as a privileged motif for nucleoside-based therapeutics.

CHEMICAL SOCIETY REVIEWS (2023)

Review Chemistry, Multidisciplinary

A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

Xingang Liu et al.

Summary: Solvent-free and environmentally friendly mechanochemistry is a promising alternative to traditional liquid-phase reactions, utilizing mechanical energy to promote chemical transformations and design complex molecules and nanostructured materials, accelerating reaction rates and efficiencies. This review discusses the latest advances in mechanochemistry for energy materials preparation and modification, and proposes next-generation advanced energy materials.

ADVANCED MATERIALS (2022)

Article Chemistry, Organic

Multi-faceted reactivity of N-fluorobenzenesulfonimide (NFSI) under mechanochemical conditions: fluorination, fluoro- demethylation, sulfonylation, and amidation reactions

Jose G. Hernandez et al.

Summary: In this study, we investigated the reactivity of NFSI by ball milling and found that it can engage in various reactions in mechanochemical processes. Mechanochemical reactions offer advantages such as solvent-free conditions, short reaction times, and comparable or higher yields compared to solvent-based reactions.

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Review Chemistry, Multidisciplinary

A guide to direct mechanocatalysis

Suhmi Hwang et al.

Summary: The article discusses the concept, historical evolution, and synthesis tool guidance of direct mechanocatalysis. It highlights the impact of milling parameters, catalysts and additives, the scope of reactions, and the hypotheses on the mechanisms of mechanocatalytic transformations.

CHEMICAL COMMUNICATIONS (2022)

Review Chemistry, Multidisciplinary

Biological Utility of Fluorinated Compounds: from Materials Design to Molecular Imaging, Therapeutics and Environmental Remediation

Cheng Zhang et al.

Summary: This review discusses the applications of fluorinated molecules in bioengineering and nanotechnology, with a focus on controlling fluorine-fluorine interactions and understanding their impact on biological behavior. The controlled introduction of fluorine and its interactions can provide advantages in imaging, therapeutics, and environmental applications.

CHEMICAL REVIEWS (2022)

Review Chemistry, Multidisciplinary

Mechanochemical Organocatalysis: Do High Enantioselectivities Contradict What We Might Expect?

Matthew T. J. Williams et al.

Summary: Ball mills input energy by pulverising contents of the jar to samples, while enantioselective organocatalytic reactions proceed through perceived transition states. This review focuses on the combination of organocatalytic reactions with mechanochemical ball milling conditions, with particular emphasis on stereoselectivity control.

CHEMSUSCHEM (2022)

Review Chemistry, Organic

Facile and Environment-friendly Fluorinations using Ionic Liquids

Komal Jakhar

Summary: Recent innovations in fluorination techniques highlight the significant role of ionic liquids in fluorotransformations, such as the use of tagged ionic liquids in nucleophilic fluorinations, ionic liquid assisted biological fluorination, enantioselective fluorinations using chiral electrophilic reagents in ionic liquid media, task-specific ionic liquids in electrochemical fluorinations with mediators, and ionic liquid promoted synthesis of medicinally important fluorinated heteroaromatics and radiopharmaceuticals.

CURRENT ORGANIC SYNTHESIS (2022)

Review Chemistry, Organic

Manufacturing Approaches of New Halogenated Agrochemicals

Peter Jeschke

Summary: To ensure sustainability, the agrochemical industry faces challenges in providing high-quality food, water use, environmental impact, and growing world population. Developing new agrochemicals with improved efficacy and favorable environmental profiles is essential, with the introduction of halogen atoms as an important tool to influence physico-chemical properties.

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY (2022)

Review Chemistry, Organic

Sustainable Mechanosynthesis of Biologically Active Molecules

Ophelie Bento et al.

Summary: This Review focuses on the applications of synthetic mechanochemistry in the preparation of known APIs and evaluated bioactive molecules. Three families of compounds, including heterocyclic compounds, metal complexes, and peptides, are discussed. The advantages of mechanochemistry approach are highlighted in terms of green chemistry and efficacy.

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY (2022)

Review Chemistry, Multidisciplinary

A Perspective on Late-Stage Aromatic C-H Bond Functionalization

Li Zhang et al.

Summary: Aromatic C-H late-stage functionalization poses challenges in terms of reactivity, selectivity, and substrate scope, but also shows potential for development. It is necessary to address current challenges and explore new strategies and directions for growth.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Mechanochemical Applications of Reactive Extrusion from Organic Synthesis to Catalytic and Active Materials

Emanuela Calcio Gaudino et al.

Summary: In the past, mechanochemical methods in organic synthesis were considered as curiosities, but in the last two decades, perceptions have shifted and this technology is now recognized as a greener and more efficient method. The availability of diverse ball mills has contributed to its development. However, the batch nature of mechanochemical methods has limited their industrial scale-up. Reactive extrusion, a new technique that activates chemical reactions with mechanical forces in a continuous flow, offers a promising solution. This environmentally friendly method allows for miniaturization of production plants, removing organic solvents and operating in a flow mode, while also offering simplicity, safety, and cleanliness.

MOLECULES (2022)

Review Chemistry, Multidisciplinary

Halide-containing organic persistent luminescent materials for environmental sensing applications

Feiyang Li et al.

Summary: Recent years have seen significant progress in the development of organic persistent luminescent (OPL) materials, with a particular focus on their applications in environmental sensing. The review summarizes the current status of halide-containing OPL materials for environmental sensing, discussing photophysical processes, luminescence mechanisms, and applications such as sensing temperature, oxygen, H2O, UV light, and organic solvents. Challenges and future research opportunities in the field are also addressed, aiming to provide guidance for material design of OPL sensors and exploring new directions for organic optoelectronics applications.

CHEMICAL SCIENCE (2022)

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Mechanochemical Aliphatic Iodination (and Bromination) by Cascaded Cyclization

Ankita Bal et al.

Summary: In this study, oxazoline derivatives were successfully synthesized from N-allyl benzamides through a mechanochemical cascaded cyclization and halogenation using N-iodo- and N-bromosuccinimides as bifunctional reagents.

ASIAN JOURNAL OF ORGANIC CHEMISTRY (2022)

Article Chemistry, Applied

Mechanochemical Direct Fluorination of Unactivated C(sp3)-H Bonds

Sehye Min et al.

Summary: The mechanochemical fluorination of unactivated C(sp(3))-H bonds has been achieved using N-fluorobenzenesulfonimide as both a precursor of the hydrogen-atom-transfer reagent and a bench-stable fluorine source. Control experiments have confirmed the essential role of mechanical energy in this reaction.

ADVANCED SYNTHESIS & CATALYSIS (2022)

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Electrophilic fluorination of heterocyclic compounds with NF reagents in unconventional media

Gennady I. Borodkin et al.

Summary: This study summarizes and analyzes the data on the electrophilic fluorination of heterocyclic compounds with NF reagents in unconventional media (ionic liquids, water and aqueous solutions, solvent-free media). The effect of the medium and the problem of selectivity were particularly considered.

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anti-Markovnikov Iodofluorination of Alkenes

Bai-Yu Qian et al.

Summary: In this paper, a convenient anti-Markovnikov iodofluorination of alkenes was described using Selectfluor/(Bu4NI)-Bu-n as the reagent. The reaction showed a broad substrate scope, good functional group tolerance, and the ability to construct various C-F bonds.

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Synthetic metabolism for biohalogenation

Antonin Cros et al.

Summary: We suggest that deploying synthetic metabolism tailored for biohalogenation presents a unique opportunity for economically attractive and environmentally friendly organohalide production.

CURRENT OPINION IN BIOTECHNOLOGY (2022)

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New Halogen-Containing Drugs Approved by FDA in 2021: An Overview on Their Syntheses and Pharmaceutical Use

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Summary: This review discusses the FDA-approved drugs in 2021 that contain at least one halogen atom. The synthesis and therapeutic uses of these drugs are presented, highlighting the growing importance of halogens, particularly fluorine and chlorine, in the development of drugs for various diseases.

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Mechanistic Study of the Mechanochemical PdII-Catalyzed Bromination of Aromatic C-H Bonds by Experimental and Computational Methods

Dajana Baris et al.

Summary: The mechanism of mechanochemical Pd-II-catalyzed selective bromination of the carbon-hydrogen bond in azobenzene was investigated using in situ time-resolved Raman spectroscopy and quantum-chemical calculations. It was found that the reaction pathway via monomeric palladacycle is more efficient, offering better yields and faster reactions.

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Synthesis and Selected Transformations of 2-Unsubstituted Imidazole N-Oxides Using a Ball-Milling Mechanochemical Approach

Grzegorz Mloston et al.

Summary: Synthetically relevant 2-unsubstituted imidazole N-oxides were successfully synthesized using the ball-milling mechanochemical method. This approach not only expanded the scope of the known method, but also enabled the preparation of previously little known N(1)-aryl-substituted derivatives. These derivatives are important starting materials for the synthesis of more complex imidazole-based organic materials. Additionally, the study also investigated selected one-pot mechanochemical transformations including N- and O-alkylations as well as sulfur transfer reactions.

CATALYSTS (2022)

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A Fruitful Decade of Organofluorine Chemistry: New Reagents and Reactions

Feng-Ling Qing et al.

Summary: The development of synthetic methods for introducing fluorine atoms and fluoroalkyl groups into organic molecules has received increased attention. Synthetic organic chemists have made significant contributions in the field of organofluorine chemistry and the newly developed methods are typically safer and more effective than traditional methods.

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Mechanochemical Approach towards Multi-Functionalized 1,2,3-Triazoles and Anti-Seizure Drug Rufinamide Analogs Using Copper Beads

Dhananjay Bhattacherjee et al.

Summary: Highly regiospecific azide-alkyne cycloaddition (AAC) reactions have been achieved under mechanochemical conditions. Cu beads were used for efficient synthesis of complex compounds without generating unwanted byproducts. High-speed ball milling strategy was applied for the synthesis of pharmaceutical agents and structural confirmation.

MOLECULES (2022)

Review Chemistry, Applied

Mechanochemically Induced Cross Dehydrogenative Coupling Reactions under Ball Milling

Ilya N. Egorov et al.

Summary: This review highlights the various applications of cross dehydrogenative coupling reactions under ball milling for the synthesis of useful molecules in a more efficient and convenient manner.

ADVANCED SYNTHESIS & CATALYSIS (2022)

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Mechanochemical halogenation of unsymmetrically substituted azobenzenes

Dajana Barisic et al.

Summary: This study describes the direct and selective mechanochemical halogenation of C-H bonds in unsymmetrically substituted azobenzenes using N-halosuccinimides as the halogen source in a ball mill. The reaction occurs in the absence or presence of PdII catalysts depending on the azobenzene substrate used. In situ Raman spectroscopy, ex situ NMR spectroscopy, and PXRD analysis were used to gain insight into the reaction dynamics and characterization of the products. The different 4,4'-substituents of azobenzene were found to have a strong influence on the halogenation time and mechanism.

BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY (2022)

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Automated grindstone chemistry: a simple and facile way for PEG-assisted stoichiometry-controlled halogenation of phenols and anilines using N-halosuccinimides

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Summary: A green and facile mechanochemical method for the catalyst-free halogenation of phenols and anilines was developed using a simple electrical mortar and PEG-400 as the grinding auxiliary. The reaction proceeded in good yields within a short reaction time, and the selectivity was controlled by the stoichiometry of N-halosuccinimides (NXS). PEG-400 played a key role in controlling the reactivity and improving regioselectivity.

BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY (2022)

Article Chemistry, Multidisciplinary

Mechanochemical Metal-Free Synthesis of 3-Arylindenones via Unprecedented Aryl Swapping

Liang Li et al.

Summary: This study reveals a novel annulation reaction of benzoic acids with arylalkynes induced by triflic anhydride under an air atmosphere and ball-milling conditions. The reaction proceeds through an unprecedented aryl swapping pathway, resulting in diverse 3-arylindenones. The mechanochemical protocol offers advantages such as no requirement of transition-metal catalysts, ambient conditions, and excellent regioselectivity for the rearrangement products, allowing efficient access to 3-arylindenones containing various functional groups.

CHINESE JOURNAL OF CHEMISTRY (2022)

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Mechanochemical Synthesis of Fluorinated Imines

Karolina Ciesielska et al.

Summary: A solvent-free mechanochemical method was used to synthesize a number of imines, including 12 new compounds. The method resulted in short reaction times, high yields, and has potential for large-scale synthesis. It also contributes to environmental protection. The method is versatile and can be applied to the synthesis of chiral benzylamines and similar amines.

MOLECULES (2022)

Article Chemistry, Organic

Sulfonimidamides by Sequential Mechanochemical Chlorinations and Aminations of Sulfinamides

Steven Terhorst et al.

Summary: The first mechanochemical synthesis of sulfonimidamides is reported in this study. This one-pot, two-step method does not require a solvent or inert conditions. Sulfinamides are rapidly converted to sulfonimidoyl chlorides through oxidative chlorination with N-chlorosuccinimide (NCS) in a mixer mill, followed by substitution with amines to provide a wide range of diversely substituted sulfonimidamides.

ORGANIC LETTERS (2022)

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POLYMER JOURNAL (2022)

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N2,N6-Bis(6-iodo-2-methyl-4-oxoquinazolin-3(4H)-yl)pyridine-2,6-dicarboxamide

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MOLBANK (2022)

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Federico Casti et al.

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BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY (2022)

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Ionic Liquids as Organocatalysts for Nucleophilic Fluorination: Concepts and Perspectives

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MOLECULES (2022)

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Mechanochemical Bromination of Naphthalene Catalyzed by Zeolites: From Small Scale to Continuous Synthesis

Karen J. Ardila-Fierro et al.

Summary: We developed a mechanochemical bromination method catalyzed by zeolites in a ball mill and twin-screw extrusion, enabling continuous reactions of organic substrates. The use of DBDMH as a brominating agent improved the atom economy of the reaction.

CHEMISTRYMETHODS (2022)

Review Chemistry, Organic

Oxidative Halogenation of Arenes, Olefins and Alkynes Mediated by Iodine(III) Reagents

Luis A. Segura-Quezada et al.

Summary: Iodine(III)-based reagents are widely used in oxidative reactions for structural functionalization, including fluorination, chlorination, bromination, and iodination protocols. These reagents are applied in oxidative halogenation procedures of arenes, olefins, and alkynes, highlighting the discovery and application of new iodine(III)-based halogenating species.

MINI-REVIEWS IN ORGANIC CHEMISTRY (2021)

Article Chemistry, Analytical

Molecular Basis for the Remarkably Different Gas-Phase Behavior of Deprotonated Thyroid Hormones Triiodothyronine (T3) and Reverse Triiodothyronine (rT3): A Clue for Their Discrimination?

Davide Corinti et al.

Summary: Thyroid hormones play crucial roles in growth, metabolic regulation, and LC-MS has been used to quantify their blood levels. The gas-phase behavior of isomeric thyroid hormones T3 and rT3 was studied, revealing different deprotonation sites and ion-mobility behavior, with rT3 found to be more acidic than T3.

ANALYTICAL CHEMISTRY (2021)

Article Chemistry, Applied

1,2-Benzothiazine Derivatives from Sulfonimidamides by Metal-Catalyzed Annulation Reactions in Solution and under Solvent-Free Mechanochemical Conditions

Jan-Hendrik Schobel et al.

Summary: Two different protocols were presented for the preparation of three-dimensional aza-analogues of 1,2-benzothiazine 1,1-dioxides from sulfonimidamides. The first method involves a rhodium-catalyzed annulation reaction to produce 4-unsubstituted benzothiazine derivatives, while the second method utilizes an iridium catalyst under solvent-free mechanochemical conditions to obtain products with 3,4-disubstituted thiazine rings.

ADVANCED SYNTHESIS & CATALYSIS (2021)

Review Chemistry, Applied

Liquid-Assisted Grinding Mechanochemistry in the Synthesis of Pharmaceuticals

Ping Ying et al.

Summary: Liquid-assisted grinding (LAG) has emerged as an innovative solvent-free mechanochemical method with wide applications in the synthesis of various compounds, especially showing superiority in the synthesis of active pharmaceutical ingredients and drug-like fragments.

ADVANCED SYNTHESIS & CATALYSIS (2021)

Review Chemistry, Multidisciplinary

Decarboxylative Halogenation of Organic Compounds

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Summary: Decarboxylative halogenation is a crucial method for synthesizing organic halides by converting carboxylic acids to the corresponding organic halides. This method involves the synthesis of organic iodides, bromides, chlorides, and fluorides, providing a wide range of methods and advantages.

CHEMICAL REVIEWS (2021)

Review Chemistry, Multidisciplinary

Fluorinated Pyrazoles: From Synthesis to Applications

Pavel K. Mykhailiuk

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CHEMICAL REVIEWS (2021)

Review Chemistry, Inorganic & Nuclear

Advances in fluorescent and colorimetric sensors for anionic species

Daniel A. McNaughton et al.

Summary: This review presents recent developments in fluorescent and colorimetric anion sensors, utilizing various non-covalent interactions and advancements in anion-selective chemodosimeters.

COORDINATION CHEMISTRY REVIEWS (2021)

Article Chemistry, Physical

Theoretical Study of the Grinding and Homogenization of a Binary Mixture of Reactive Powders in a Mechanical Activator

O. V. Lapshin et al.

Summary: A theoretical study was conducted on solid-phase mechanochemical synthesis in a binary powder mixture during mechanical processing in a mechanoactivator using a mathematical model in a macroscopic approximation. Analytical relationships were obtained for determining the process parameters, providing a method for finding an effective kinetic constant characterizing the degree of homogenization of the powder mixture.

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A (2021)

Review Chemistry, Multidisciplinary

The many flavours of mechanochemistry and its plausible conceptual underpinnings

Robert T. O'Neill et al.

Summary: Mechanochemistry involves diverse phenomena where mechanical load influences chemical reactions, such as motor protein function, organic synthesis in a ball mill, reactions at a propagating crack, chemical actuation, and polymer fragmentation. The rate of deformation in mechanochemistry affects which and how many bonds break, either powering macroscopic motion in otherwise endergonic reactions or being driven by spontaneous chemical reactions. The complexity of mechanochemistry lies in the dynamic coupling between inertial motion at the microscale and changes in chemical bonding across multiple length scales and timescales.

NATURE REVIEWS CHEMISTRY (2021)

Article Chemistry, Multidisciplinary

Understanding Ball Milling Mechanochemical Processes with DFT Calculations and Microkinetic Modeling

Bruna S. Pladevall et al.

Summary: Mechanochemistry is a new field with potential applications in sustainable chemistry, but its underlying mechanistic foundations are not fully understood. This study used computational tools to analyze mechanically activated procedures, successfully reproducing experimentally reported reaction times. The findings suggest that reactions accelerated by ball milling follow the same mechanism as equivalent reactions in solution.

CHEMSUSCHEM (2021)

Review Chemistry, Multidisciplinary

Sustainability Assessment of Mechanochemistry by Using the Twelve Principles of Green Chemistry

Karen J. Ardila-Fierro et al.

Summary: Mechanochemistry has become a widely accepted alternative for chemical synthesis due to its efficiency, practicality, and sustainability, satisfying multiple Principles of Green Chemistry.

CHEMSUSCHEM (2021)

Review Chemistry, Inorganic & Nuclear

Role of Mixing and Milling in Mechanochemical Synthesis (Review)

O. V. Lapshin et al.

Summary: The discussion includes various topics on inorganic mechanochemical synthesis, covering synthesis methods, monitoring techniques, yield control, kinetics, as well as comparisons between thermal and mechanochemical syntheses with a focus on mixing and milling processes. The effects of mechanical treatment on individual particles and mixtures, and the role of macrokinetics in mixing processes, are also examined. Additionally, the basic assumptions for a mathematical model describing the macrokinetics of mechanochemical synthesis in solid + reactive gas and solid + solid systems are outlined.

RUSSIAN JOURNAL OF INORGANIC CHEMISTRY (2021)

Article Chemistry, Applied

Mechanochemical Transformation of CF3 Group: Synthesis of Amides and Schiff Bases

Satenik Mkrtchyan et al.

Summary: In this study, two mild, solvent-free mechanochemical coupling transformations of CF3 group with nitro compounds were successfully demonstrated, leading to amides or Schiff bases. Ytterbia was used as a catalyst to facilitate the process, which involves C-F bond activation and the use of Si-based reductants/oxygen scavengers. This work represents the first example of utilizing mechanical energy to promote the transformation of the inert CF3 group into other functionalities.

ADVANCED SYNTHESIS & CATALYSIS (2021)

Review Chemistry, Organic

Development of N-F fluorinating agents and their fluorinations: Historical perspective

Teruo Umemoto et al.

Summary: This review covers the historical development of all N-F fluorinating agents developed to date, including various types of N-F compounds and their derivatives. It discusses the unique properties of fluorine that make fluorinated organic compounds attractive in research, and the usefulness of N-F agents due to their easy handling. The review also chronicles the synthesis, reactions, and relative fluorination power of each reagent from a historical perspective.

BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY (2021)

Article Chemistry, Organic

Mechanochemical-Cascaded C-N Cross-Coupling and Halogenation Using N-Bromo- and N-Chlorosuccinimide as Bifunctional Reagents

Shyamal Kanti Bera et al.

Summary: The study demonstrated the successful synthesis of phenanthridinone derivatives using NBS and NCS as bifunctional reagents under mechanochemical conditions. This approach allowed for the cascaded C-N bond formation and subsequent halogenation reactions, showcasing a potential application of alternative energy sources in chemical transformations.

JOURNAL OF ORGANIC CHEMISTRY (2021)

Article Biochemistry & Molecular Biology

Ionic Liquid-Assisted Grinding: An Electrophilic Fluorination Benchmark

Pavel A. A. Zaikin et al.

Summary: The influence of liquid additives on the rate and selectivity of mechanochemical fluorination has been demonstrated, with ionic liquids shown to catalyze the reaction and improve the isolation of fluorinated products. A careful choice of additive results in high yields of fluorinated products and low E-factor for the overall process.

MOLECULES (2021)

Article Chemistry, Multidisciplinary

Mechanochemical N-Chlorination Reaction of Hydantoin: In Situ Real-Time Kinetic Study by Powder X-ray Diffraction and Raman Spectroscopy

Ines C. B. Martins et al.

Summary: In this study, the kinetic profile of the chlorination reaction of N-3-ethyl-5,5-dimethylhydantoin (EDMH) activated and driven by ball milling was investigated. The results show that the reaction progress to equilibrium is similar at different ball sizes, but the induction period and reaction rate are affected by ball size. The research demonstrates a significant correlation between the rate of chemical transformations during the reaction and the volume of the milling balls used.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2021)

Review Chemistry, Organic

Electrophilic and Oxidative Fluorination of Heterocyclic Compounds: Contribution to Green Chemistry

G. I. Borodkin et al.

Summary: The literature data on electrophilic and oxidative fluorination of heterocyclic compounds have been analyzed in terms of green chemistry principles, with a focus on reaction mechanisms and selectivity issues.

RUSSIAN JOURNAL OF ORGANIC CHEMISTRY (2021)

Review Chemistry, Organic

Halogen bond-induced electrophilic aromatic halogenations

Wanutcha Lorpaiboon et al.

Summary: In recent years, there has been increased interest in utilizing halogen bonds in organic synthesis, particularly in aromatic halogenation reactions. N-Halosuccinimides and 1,3-dihalo-5,5-dimethylhydantoins are commonly used sources of halonium ions due to their easy handling and low toxicity. Recent research has shown that activation of N-haloimides by nucleophilic Lewis base catalysts can lead to a shift in the paradigm of aromatic halogenation.

ORGANIC & BIOMOLECULAR CHEMISTRY (2021)

Review Chemistry, Multidisciplinary

Halogen bonding in polymer science: towards new smart materials

Robin Kampes et al.

Summary: The halogen bond, while underrepresented in polymer science, shows great potential for designing polymeric materials. Applications of halogen bonding in self-assembly, photo-responsive materials, and self-healing materials are currently expanding.

CHEMICAL SCIENCE (2021)

Article Chemistry, Multidisciplinary

Accessing novel fluorinated heterocycles with the hypervalent fluoroiodane reagent by solution and mechanochemical synthesis

William Riley et al.

Summary: A new and efficient strategy has been developed for the rapid formation of novel fluorinated tetrahydropyridazines and dihydrooxazines by fluorocyclisation of beta,gamma-unsaturated hydrazones and oximes with the fluoroiodane reagent. Mechanochemical synthesis showed similar yields for fluorinated tetrahydropyridazines compared to conventional solution synthesis, while fluorinated dihydrooxazines were prepared in much better yields through ball-milling.

CHEMICAL COMMUNICATIONS (2021)

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Medicinal chemistry strategies for discovering antivirals effective against drug-resistant viruses

Yue Ma et al.

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CHEMICAL SOCIETY REVIEWS (2021)

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Solvent and catalyst-free bromofunctionalization of olefins using a mechanochemical approach

Jonathan Wong et al.

Summary: Bromofunctionalization of olefins is an important chemical transformation, typically utilizing N-bromoimide reagents and catalysts. However, this study demonstrates a solvent and catalyst-free approach to achieving bromofunctionalization of olefins using mechanical force.

RSC ADVANCES (2021)

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Synthesis, characterization and antioxidant activity studies of new coumarin tethered 1,3,4-oxadiazole analogues

Vagish Channa Basappa et al.

Summary: In this study, a series of novel substituted 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-2H-chromen-2-one compounds were synthesized using substituted aldehydes and hydrazine hydrates analogues in the presence of Iodine by grinding technique. The structures of the compounds were characterized using spectroscopic techniques. Results showed that compounds 7d and 7i exhibited strong radical scavenging activity, indicating potential antioxidant properties.

JOURNAL OF CHEMICAL SCIENCES (2021)

Article Chemistry, Multidisciplinary

Mechanochemistry of fluoride solids: from mechanical activation to mechanically stimulated synthesis

Gudrun Scholz

Summary: This lecture text focuses on the relatively young field of mechanochemistry of fluoride solids, covering both their mechanical activation and their mechanochemical synthesis. The examples provided mainly involve alkaline earth metal compounds, which have interesting potential applications in the field of fluoride ion conductivity or luminescence properties.

CHEMTEXTS (2021)

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Tomislav Friscic et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

Article Chemistry, Multidisciplinary

Mechanochemical Synthesis of Functionalized Quinolines by Iodine Mediated Oxidative Annulation

Atreyee Halder et al.

CHEMISTRY-AN ASIAN JOURNAL (2020)

Review Chemistry, Multidisciplinary

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