The reaction of Et2Zn with NaOCH2CH2OH yielded a bimetallic zinc complex NaOCH2CH2⋅OZnEt. Its reactions with Ph3SnCl, Cp2TiCl2, and Cp2LuCl(THF) afforded the corresponding complexes Ph3SnOCH2CH2OZnEt, Cp2Ti(OCH2CH2OZnEt)2, and Cp2LuOCH2CH2OZnEt. Cp2Ti(OCH2CH2OZnEt)2 catalyzes copolymerization of CO2 with cyclohexene oxide at room temperature and atmospheric pressure; the yield of the polycarbonate is 4 g g−1 catalyst. Ph3SnOCH2CH2OZnEt is catalytically inert under these conditions, and with Cp2LuOCH2CH2OZnEt only the polyether is formed.
Et2Zn与NaOCH2CH2OH反应生成双
金属
锌配合物NaOCH2CH2⋅OZnEt。它与Ph3SnCl、Cp2TiCl2和Cp2LuCl(THF)反应分别得到相应的配合物Ph3SnOCH2CH2OZnEt、Cp2Ti(OCH2CH2OZnEt)2和Cp2LuOCH2CH2OZnEt。Cp2Ti(OCH2CH2OZnEt)2在室温和常压下催化
CO2与环氧
环己烷的共聚反应;聚
碳酸酯的产率为4 g催化剂−1。在这些条件下,Ph3SnOCH2CH2OZnEt没有催化活性,而Cp2LuOCH2CH2OZnEt只能生成聚醚。