Novel ruthenium-catalyzed reactions that employ ruthenium trichloride n-hydrate (RuCl3·nH2O) were investigated and dimerization, alkoxylation and sulfidation of olefins were noted. Adducts of Markovnikov type and anti-Markovnikov type were obtained in a stereospecific manner and in good yield, depending on the type of olefins used as the starting materials.
Halofluorination of Alkenes Using Trihaloisocyanuric Acids and HF×Pyridine
作者:Marcio de Mattos、Pierre Esteves、Lívia Crespo、Rodrigo Ribeiro
DOI:10.1055/s-0029-1220011
日期:2010.7
Halofluorination of alkenes with a new system (trihaloisocyanuric acids and HFËpyridine) results in the formation of vicinal halofluoroalkanes. The reaction is regioselective leading to Markovnikov-oriented products and the halofluorinated adducts follow anti-addition in the case of cyclohexene and 1-methylcyclohexene. Reaction yields range from 67-88%.
organic synthesis due to their high reactivity. Herein, we report a Lewis acid-catalyzed cross-coupling reaction of mono- and disubstituted gem-difluorinated cyclopropanes with nucleophiles. The formation of a fluoroallyl cation species triggered via the Lewisacid-assisted activation of the C–F bond is proposed in this transformation. The cation species is then trapped by the nucleophiles, including