Add time:07/25/2019         Source:sciencedirect.com

Polymerizations of methyl methacrylate and ethyl methacrylate with combinations of t-butyllithium and several bulky alkylaluminum bisphenoxides were carried out in toluene at −78°C. Methylaluminum bisphenoxide derivatives gave heterotactic polymers which comprise an alternating sequence of meso and racemo diads. On the other hand, ethyl or isobutylaluminum bis(2,6-di-t-butylphenoxide) exhibited syndiotactic-specificity. The effect of structure of bulky aluminum phenoxide on stereospecificity of polymerization was discussed based on the stereochemical analysis of the polymers.

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