Group 4 initiators for the stereoselective ROP of rac-beta-butyrolactone and its copolymerization with rac-lactide

In this paper we demonstrate the utility of Group 4 metals for the well-controlled and stereoselective (syndiotactic) ring opening polymerization (ROP) of rac-beta-butyrolactone (BBL) and their ability to form copolymers.