A novel enzymatic tandem procedure for the synthesis of substituted polyesters starting from ketones has been developed. Candida antarctica lipase B (CAL-B) was used as a catalyst for the whole procedure consisting of the Baeyer-Villiger oxidation (BVO) of substituted ketones and the subsequent ringopening polymerization (ROP) of corresponding substituted lactones. The products of oxidation and polymerization were characterized by 1 H-NMR, IR and GPC. The substituents of the ketones greatly influenced the molecular weights of the obtained polyesters, ranging from 1000 to 12 800.
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