Regioselective ringexpansion of alkynyl cyclopropanes to highly substituted cyclobutenes was developed. The reactioninvolves a copper-catalyzed cycloaddition of an alkyne with an arylsulfonyl azide and a silver-catalyzed carbene formation followed by ringexpansion of a cyclopropyl carbene intermediate.
Radical hydroformylation and hydrogenation of cyclopropenes with HCo(CO)4 and HMn(CO)5
作者:Theodore E. Nalesnik、John H. Freudenberger、Milton Orchin
DOI:10.1016/s0022-328x(00)86753-4
日期:1982.9
The results of a study of the reactions of HCo(CO)4 and HMn(CO)5 with a variety of a substituted cyclopropenes are consistent with the formation of the intermediate caged radical pairs; recombination in the cage of the radical pair leads to hydroformylation, and cage escape leads to hydrogenation. Steric factors play an important role in determining rates as well as the stereochemistry of the products
Olefin reactions with HMn(CO)5: Product selectivity by micelle sequestering
作者:Yasushi Matsui、Milton Orchin
DOI:10.1016/0022-328x(83)80045-x
日期:1983.3
The reaction of HMn(CO)5 with certain cyclopropenes when carried out in a detergent medium gives a different mixture of hydroformylated and hydrogenated products than is obtained when the same reaction is carried out in a homogeneous medium. These results are consistent with the intermediacy of caged geminate radical pairs whose escape from the cage is retarded by micelle sequestering.
Rhodium-Catalyzed Transannulation of 1,2,3-Triazoles with Nitriles
作者:Tony Horneff、Stepan Chuprakov、Natalia Chernyak、Vladimir Gevorgyan、Valery V. Fokin
DOI:10.1021/ja805079v
日期:2008.11.12
Stable and readily available 1-sulfonyl triazoles are converted to the corresponding imidazoles in good to excellent yields via a rhodium(II)-catalyzed reaction with nitriles. Rhodium iminocarbenoids are proposed intermediates.
Grimster, Neil; Zhang, Li; Fokin, Valery V., Journal of the American Chemical Society, 2010, vol. 132, p. 2510 - 2511