The combination of CH3C(O)Co(CO)3P(o-tolyl)3/m-methoxypyridine serves as a versatile catalyst for both the carbonylative polymerizations of epoxides and N-alkylaziridines under closely resembling mechanistic hypotheses. Diblock poly(beta-alanoid-b-beta-hydroxypropionate)s can be synthesized even when the aziridine and epoxide comonomers are added all together at the beginning of the reaction.
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Liu et al. (2004) studied this question.
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