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- W2899361113 abstract "ABSTRACT Spirocyclic phenoxides of germanium, zirconium, and tin were prepared from 2,2′‐dihydroxybiphenyl and 2,2′‐dihydroxy‐1,1′‐binaphthyl. Ring‐expansion polymerizations of l ‐lactide are mainly studied at 160 or 180 °C. The reactivity of the catalysts increases in the order: Zr < Ge < Sn. Regardless of catalyst, the weight‐average molecular weights ( M w ) never exceed 50,000 g mol −1 . The resulting poly( l ‐lactide)s are optically pure and have a cyclic architecture. Decreasing temperature and time favor formation of even‐numbered cycles, and at 102° cyclics, almost free of odd‐numbered rings are obtained. Analogous polymerizations of meso‐lactide give similar results >120 °C, but different results at 100 or 80 °C. Surprisingly, bell‐shaped narrow molecular weight distributions are obtained <140 °C, resembling the pattern of living polymerizations found for alcohol‐initiated polymerizations. An unusual transesterification mechanism yielding narrow distributions of odd‐numbered cycles is discovered too. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 2730–2738" @default.
- W2899361113 created "2018-11-09" @default.
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- W2899361113 date "2018-10-29" @default.
- W2899361113 modified "2023-10-05" @default.
- W2899361113 title "Spirocyclic bisphenoxides of Ge, Zr, and Sn as catalysts for ring-expansion polymerizations of <scp>l</scp> - and meso-lactide" @default.
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- W2899361113 doi "https://doi.org/10.1002/pola.29259" @default.
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