Journal
INORGANIC CHEMISTRY
Volume 60, Issue 18, Pages 13960-13967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c00855
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Funding
- Russian Science Foundation (RSF) [20-13-00155]
- Ministry of Science and Higher Education of the Russian Federation
- RUDN University Strategic Academic Leadership Program
- Russian Science Foundation [20-13-00155] Funding Source: Russian Science Foundation
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The study presents the synthesis of two diastereomeric cationic octahedral Co(III) complexes based on commercially available (R,R)-1,2-diphenylethylenediamine and salicylaldehyde. These complexes exhibited high selectivity and catalytic activity in challenging kinetic resolution reactions.
Here we report the first synthesis of two diastereomeric cationic octahedral Co(III) complexes based on commercially available (R,R)-1,2-diphenylethylenediamine and salicylaldehyde. Both diastereoisomers with opposite chiralities at the metal center (Lambda and Delta configurations) were prepared. The new Co(III) complexes possessed both acidic hydrogen-bond donating (HBD) NH moieties and nucleophilic counteranions and operate as bifunctional chiral catalysts for the challenging kinetic resolution of terminal and disubstituted epoxides by the reaction with CO2 under mild conditions. The highest selectivity factor (s) of 2.8 for the trans-chalcone epoxide was achieved at low catalyst loading (2 mol %) in chlorobenzene, which is the best achieved result currently for this type of substrate.
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