... 5082 J. Org. Chem., Vol. ... Rf = F, CF,; R = alkyl or perfluoroalkyl; X = C1, Br; Y = C1, Br inaccessible by other method^.^ As part of a continuing study in the chemistry of very strong electrophiles, we were interested in the synthesis of new reagents bearing elec- trophilic halogens. ...
