Abstract
Bu3SnOEt, Bu2Sn(OEt)2, and BuSn(OEt)3 were used as initiators of ring‐opening polymerizations of ϵ‐caprolactone conducted in 2 M solutions in chlorobenzene with monomer/functional group ratios of 50/1. Time‐conversion curves were recorded in the temperature range of 30–90°C. The reactivity of the initiators increased with the number of alkoxy groups attached to the tin atom. Analogous results were obtained with Bu3SnOMe and Bu2Sn(OMe)2. MALDI‐TOF mass spectra of the polyesters isolated after 98–99% conversion indicated the presence of small amounts of cyclic oligomers (up to 2000 Da) even at reaction temperatures as low as 30°C. Due to transesterification also broad molecular weight distributions were found.
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