Remarkable Stereocontrol in the Polymerization of Racemic Lactide Using Aluminum Initiators Supported by Tetradentate Aminophenoxide Ligands

A new family of aluminum complexes bearing tetradentate bis(aminophenoxide) ligands is reported and shown to initiate the living ring-opening polymerization of rac-lactide. The microstructures of the polylactide products are found to be highly dependent upon the ancillary ligand substituents, ranging from highly isotactic (Pm = 0.79) to very highly heterotactic (Pr = 0.96).

本研究报道了一类新型的搭载四齿双(氨基苯氧基)配体的铝配合物，并证实其可引发外消旋丙交酯的活性开环聚合。研究发现，所得聚丙交酯产物的微观结构高度依赖于辅助配体的取代基修饰，其立构规整性可从高全同立构（Pm = 0.79）跨度至极高杂同立构（Pr = 0.96）。