(Benzyloxycarbonylmethyl)triphenylphosphonium bromide is a reactant for an atypical aza-Morita-Baylis Hillman mechanism, a thermal decomposition,double aza-Michael reaction, cyclodextrin derivatives, stereoselective preparation of α,β-unsaturated carbonyl compounds via stereoselective Wittig olefination with aldehydes under solventless conditions or ultrasonication, and a synthesis of [difluoro(alkenylphenyl)methyl]phosphonic acids on non-crosslinked polystyrene as inhibitors of PTP-1B via Wittig reaction.