Electronic Tuning of Iminotriphenolate Ligands for Titanium(IV)-catalyzed ROCOP of Cyclic Anhydrides and Epoxides
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This study investigated to development of an efficient Ti(IV) complex with iminophenolate ligands for alternating ring-opening copolymerization (ROCOP) of cyclic anhydrides and epoxides. ROCOP is a versatile synthetic method for preparing polyesters using relatively inexpensive and readily available monomers (epoxides and cyclic anhydrides). In comparison with flexible aminophenolate ligands, iminophenolate ligands are highly efficient for the preparation of Ti(IV)-based polymerization catalysts. Among the iminophenolate ligands, chloro-substituted ligand is the most effective and is more utilized to promote the Ti(IV)-catalyzed copolymerization of cyclic anhydrides (PA and NA) and epoxides (CHO, CPO, LO, and VCHO).