Carbene chemistry. Part V. A route to dichlorocarbene in the vapour phase
Abstract
The thermal decomposition of trifluoro (trichloromethyl) silane in the vapour phase at 140 °C in the presence of the olefins cyclohexene, CMe2:CMe2′, CMe2:CHMe, CMe2:CH2′, CH2:CH2′, CH2:CF2′, and CCl2:CCl2 leads to high yields (>85% in most cases) of the corresponding gem-dichlorocyclopropanes. The reaction is stereospecific with cis- and trans-but-2-ene, and an almost quantitative breakdown of the silane into dichlorocarbene and chlorotrifluorosilane is inferred.