1, 1-Difluoroethysilanes (R3SiCF2CH3, R= Me or Et) were synthesized from 1, 1- difluoroethyl phenyl sulfone and chlorosilanes using magnesium metal via reductive 1, 1- difluoroethylation. It was confirmed that 1, 1-difluoroethylsilanes were effective 1, 1- difluoroethylating reagents for carbonyl compounds.