Ring-Opening Copolymerization of Cyclic Anhydrides and Epoxides by bis(amidinate)tin(II)Complex via Binary Catalyst System

摘要

Bis(amidinate)tin(II)complex(1)was reported as active catalyst for ring-opening copolymerization of cyclic anhydrides and epoxides via a binary catalyst system.Polymerizations of six combinations of epoxides and cyclic anhydrides were carried out giving highly alternating poly(anhydride-alt-epoxide)with narrow dispersities,except for cyclohexene oxide where significant amount of ether linkage up to 62% was observed.This ether linkages could be diminished by increasing the amount of cocatalyst to over 3 equiv.Six well-known cocatalysts were screened where PPNCl was found to be the best cocatalyst.