Copper- and Nickel-Catalyzed Cross-Coupling Reaction of Monofluoroalkenes with Tertiary, Secondary, and Primary Alkyl and Aryl Grignard Reagents
作者:Hongyan Shi、Wenpeng Dai、Biyun Wang、Song Cao
DOI:10.1021/acs.organomet.7b00859
日期:2018.2.12
with tertiary, secondary, and primary alkyl and aryl Grignardreagents in the presence of a catalytic amount of copper or nickel catalyst, respectively, has been developed. The reactions proceeded smoothly at room temperature, providing (E)-alkene isomers in moderate to high yields. Plausible mechanisms of the Ni-catalyzed coupling reaction of monofluoroalkene with Grignardreagents are suggested.
The action of sodium hydrogen telluride on olefins
作者:Derek H.R. Barton、Luis Bohé、Xavier Lusinchi
DOI:10.1016/s0040-4020(01)87834-0
日期:1990.1
action of sodium hydrogen telluride, NaTeH, on non electrophilic carbon-arbon doublebonds has been investigated.The reaction is found to be very sensitive to the substituents on the ethylenic linkage. Whereas phenyl conjugated olefins are reduced to alkylbenzenes,the reagent adds to isolated mono and disubstituted doublebonds leading to organotellurium derivatives and with gem-disubstituted ones it leads
Mechanism of the Ni(0)-Catalyzed Vinylcyclopropane−Cyclopentene Rearrangement
作者:Selina C. Wang、Dawn M. Troast、Martin Conda-Sheridan、Gang Zuo、Donna LaGarde、Janis Louie、Dean J. Tantillo
DOI:10.1021/jo901525u
日期:2009.10.16
A combination of physical organic experiments and quantum chemical calculations were used to construct a detailed mechanistic model for the Ni(0)-N-heterocyclic carbene-catalyzed vinylcyclo-propane-cyclopentene rearrangement that involves a mutistep oxidative addition/haptotropic shift/reductive elimination pathway. No evidence for the intermediacy of radicals or zwitterions was found. The roles of substituents on the vinylcyclopropane substrate and variations in the ligands on Ni were evaluated. It is postulated that bulky carbene ligands facilitate formation of the active catalyst species.