期刊
SCIENCE CHINA-CHEMISTRY
卷 58, 期 4, 页码 673-683出版社
SCIENCE PRESS
DOI: 10.1007/s11426-014-5178-8
关键词
trifluoromethylation; redox potential; density functional theory
资金
- National Natural Science Foundation of China [21325208, 21172209, 21361140372, 21202006]
- Specialized Research Fund for the Doctoral Program [20123402110051]
- Fundamental Research Funds for the Central Universities [WK2060190025]
- Chinese Academy of Sciences [KJCX2-EW-J02]
- Fok Ying Tung Education Foundation
- Anhui Provincial Natural Science Foundation [1308085QB38]
- China Grid project - Ministry of Education of China
- supercomputer center of Shanghai
- University of Science and Technology of China
Trifluoromethylation reactions are important transformations in the research and development of drugs, agrochemicals and functional materials. An oxidation/reduction process of trifluoromethyl-containing compounds is thought to be involved in many recently tested catalytic trifluoromethylation reactions. To provide helpful physical chemical data for mechanistic studies on trifluoromethylation reactions, the redox potentials of a variety of trifluoromethyl-containing compounds and trifluoromethylated radicals were studied by quantum-chemical methods. First, wB97X-D was found to be a reliable method in predicting the ionization potentials, electron affinities, bond dissociation enthalpies and redox potentials of trifluoromethyl-containing compounds. One-electron absolute redox potentials of 79 trifluoromethyl substrates and 107 trifluoromethylated radicals in acetonitrile were then calculated with this method. The theoretical results were found to be helpful for interpreting experimental observations such as the relative reaction efficiency of different trifluoromethylation reagents. Finally, the bond dissociation free energies (BDFE) of various compounds were found to have a good linear relationship with the related bond dissociation enthalpies (BDE). Based on this observation, a convenient method was proposed to predict one-electron redox potentials of neutral molecules.
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