Palladium-catalyzed geometrically selective hydrogenation of (Z)-trifluoromethyl alkenyl triflate: an efficient approach to (Z) or (E)-3,3,3-trifluoropropenyl derivatives

A Pd-catalyzed hydrogenation of (Z)-trifluoromethyl alkenyl triflate providing either (Z)- or (E)-3,3,3-trifluoropropenyl derivatives with excellent divergent geometric control in good yield is described. Catalyzed by Pd(OAc)₂/PPh₃, the reduction of (Z)-trifluoromethyl alkenyl triflates with HSiEt₃ gave (E)-3,3,3-trifluoropropenyl derivatives, and while using HCOOH/Et₃N as the reducing agent, the (Z)-isomers were obtained through an elimination/hydrogenation tandem pathway. Both transformations showed excellent geometrical selectivity.