期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 39, 页码 15553-15558出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja204711a
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资金
- U.S. Department of Education
Calculations at the DFT level predict that benzyl anions with strong :pi-electron-withdrawing groups in the meta position(s) have low energy diradical or triplet electronic states. Specifically, the 2-(3,5-dinitrophenyl)-1,3-dithiane carbanion is predicted to have nearly degenerate singlet and triplet states at the (U)B3LYP level as a free anion. Its lithium ion pair is predicted to be a ground-state triplet with a substantial (26 kcal/mol) singlet-triplet energy gap. Experiments on this anion using chemical trapping, NMR, and the Evans method strongly suggest that this anion is either a triplet or a ground-state singlet with a very low energy triplet state.
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