Carbenoid Reactions of Organoelemental Compounds Containing Trifluoromethyl Groups: VII.2* Difluorocyclopropanation of Olefins and Dienes with a System Tris(trifluoromethyl)bismuth-Aluminum Chloride2*2*

Tris(trifluoromethyl)bismuth generates difluorocarbene at -30°C in the presence of aluminum chloride. By reaction of the difluorocarbene with isobutylene, styrene, cyclohexene, and 2,3-dimethylbutadiene the corresponding substituted difluorocyclopropanes were obtained.