Reaction of direct electrophilic perfluoroacylation of diffferent stru
cture alkenes with trifluoroacetic anhydride activated by BF3.SMe(2) c
omplex leads to trifluoromethylalkenylketones with different structure
of alkenyl group. Possible composition of the reactive species is con
sidered on the basis of IR and NMR data. Dependence of the reaction co
urse on the substrate structure is discussed.