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A novel method was developed for preparing double metal cyanide complexes based on Zn3[Co(CN)6]2 with water-insoluble zinc compounds such as ZnO, Zn(OH)2 and basic ZnCO3 as precursors. The complexes obtained exhibited nearly double catalytic efficiency for the copolymerization of propylene oxide and CO2 as compared with the complexes originating from the solution precipitation method.
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