Design of catalytic carbonylative polymerizations of heterocycles. Synthesis of polyesters and amphiphilic poly(amide-block-ester)s.

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.