期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 13, 期 23, 页码 3745-3752出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201801285
关键词
density functional calculations; DFT; hydride insertion; N-heterocyclic carbenes; reaction mechanisms
资金
- Australian Research Council [FT160100007]
- La Trobe University
The endocyclic ring expansion of N-heterocyclic carbene (NHC) rings containing one N atom and one P, N, C, O or S heteroatom has been investigated in a computational study. Ring expansion was determined to follow a common pathway, leading to a final expanded six-membered ring that was predicted to be thermodynamically stable for all heterocycles. However, reactivity is driven by kinetics with ring-expansion reactivity not expected for the P/NHC and C/NHC (cAAC) containing heterocycles due to large barriers for ring-expansion. In contrast, ring expansion is predicted to be feasible for N-heterocyclic carbenes containing an O (O/NHC) or S (S/NHC) heteroatom, with insertion into the O-C and S-C bond favoured over insertion into the N-C bond, respectively.
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