期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 775, 期 -, 页码 109-116出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2014.02.012
关键词
Nickel; N-Heterocyclic carbene; Michael reaction; Base-free; DFT studies
资金
- Department of Science and Technology, New Delhi [SR/S1/IC-15/2011]
- BRNS, Mumbai
A proposed catalytic pathway for a base-free Michael addition reaction mediated by a N/O-functionalized N-heterocyclic carbene (NHC) based bifunctional nickel precatalyst has been probed using density functional theory (DFT) studies. In particular, the base-free Michael addition of a beta-dicarbonyl compound namely, 2-acetyl-cyclopentanone (a) with methyl vinyl ketone (b) as catalyzed by a representative bifunctional nickel precatalyst viz. [1-(Me)-3-N-(methylacetamido) imidazol-2-ylidene](2)Ni (A) has been investigated. The modeling studies reveal that the nucleophilic attack of a metal bound enolate moiety of a 1,3-dicarbonyl adduct species (B) to the approaching activated olefinic substrate, methyl vinyl ketone (b), is the crucial rate-limiting step of the reaction yielding a Michael addition product adduct species (C). Interestingly, the subsequent intramolecular rearrangement of (C) to a different O-bound intermediate (D) exhibit nearly equal activation barrier. (C) 2014 Elsevier B.V. All rights reserved.
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