Lewis acid/base modulation in β-diiminate zinc-catalyzed switchable ring-opening polymerization of rac-lactide

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 475-478
• 页数: 4页
• 语种: 英文

摘要

Two β-diiminate zinc complexes were prepared and found to show high activity and well-controlled catalytic behavior in the ring-opening polymerization of rac-lactide.Coordination of the Lewis acid to the zinc complexes completely terminated the polymerization.The coordinated Lewis acid was easily cleaved by using a Lewis base,so that the polymerization could resume.Thus,switchable polymerization could be realized by the subsequent addition of a Lewis acid and a Lewis base.This work provides a new strategy to control the ring-opening polymerization of rac-lactide.