Difluoromethylcarbene for iron-catalyzed cyclopropanation†
Abstract
Difluoroethylsulfonium salt, Ph2S+CH2CF2H OTf−, was developed into a convenient difluoromethylcarbene reagent for the iron-catalyzed cyclopropanation of terminal olefins, giving various difluoromethyl–cyclopropanes with excellent diastereoselectivities and in high yields.