This work reports on the reactivity of 2-F-alkylethyl thiocyanates and isothiocyanates towards stabilized phosphonium ylides. The results led to a newmethod being devised which allowed the introduction of a perfluoroalkyl chain into the structure of a stabilized phosphonium ylide. The method has been extended with thiocyanates to allow the introduction of an alkyl or alkylaryl chain into such a structure