Synthesis and reactions of 3,3-difluoroallylphosphonates and 3,3-difluoroallyltriphenylphosphonium bromide

Article abstract of DOI:10.1016/S0022-1139(00)80486-8

3,3-Difluoroallyltriphenylphosphonium bromide (1) and 3,3-difluoroallylphosphonates, 2, have been prepared by the reaction of CH2=CHCF2Br with phosphites or triphenylphosphine in good yield.Wittig reaction of 1 with aldehydes gave the corresponding dienes (ArCH=CHCH=CF2) 4; however, Wadsworth-Emmons reaction of 2 with aldehydes failed to produce the dienes.