Allyltriphenylphosphonium Bromide

A one-component phosphonium borane Lewis pair serves as a dual initiator and catalyst in the ring-opening alternating copolymerization of anhydrides and epoxides

“…The first step involves an S N 2 substitution reaction between triphenylphosphine (PPh 3 ) and alkenyl halides to facilitate full conversion of phosphonium salts with terminal CC double bond, which showed good agreement with the reported literature. 55–57 The phosphonium salts having allyl and 3-butenyl-group were characterized by X-ray diffraction analysis (Fig. S70 and S71†).…”