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Binary system of zinc chloride‐alkali metal alkoxide was studied as catalyst for propylene oxide polymerization. The reaction of zinc chloride with alkali metal alkoxide was found to proceed steppwise according to the equations: Formation of high molecular weight polymer in the propylene oxide polymerization catalyzed by zinc chloride‐alkali metal alkoxide system is found to be caused by zinc dialkoxide formed in the reaction system. The results support our previous conclusion that the presence of alkyl‐zinc bond in zinc alkyl‐alcohol system is not necessarily an indispensable factor for high molecular weight polymer‐forming reaction.
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Ishimori et al. (1969) studied this question.
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