A direct and versatile way to prepare halogenated 2,2-difluoro-1,3-dio
xolanes through the addition of bis-(fluoroxy)difluoromethane (BDM) to
halogenated alkenes (CF2=CFCF3, CF2=CFOCF2CF3, CF2=CHCF3, CF3CF=CFCF3
, CFCl=CFCl, CFBr=CFBr, CCl2=CCl2, CHCl=CCl2, CHCl=CHCl, CH2=CHCl, CF2
=CFCl, (CF3)(2)CFCF=CFCF3, CF2=CFBr, CF2=CF2) has been discovered.