Abstract
AbstractSome significant features of a novel organometallic complex, [{MeOCH2CH(Me)OZnOCH(Me)CH2OMe}2 · {EtZnOCH(Me)CH2OMe}2] (3), as an enantiomorphic catalyst for stereoselective polymerization of propylene oxide (PO) are reported. Populations of triad tacticities of poly(PO) obtained with complex 3 as catalyst fit nicely with the theoretical curves of the one‐parameter equations for the enantiomorphic catalyst sites model. The observed σ2 value was much higher than that observed with other organozinc complexes (1 and 2) reported previously. Every molecule of complex 3 was proved to exist as a monomeric form in benzene and its structural feature was retained in solution even after the initiation stage of polymerization. The number of active sites of complex 3 for the oxirane polymerization was determined to be one by determining the 1‐methoxy‐2‐propanol liberated from the unreacted methoxypropoxy groups. The initiation and propagation mechanisms are discussed.
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