Abstract
At moderate temperatures the dimeric 2,2-dibutyl-2-stanna-1,3-dioxolane (DSDOL) and the monomeric 2,2-dibutyl-2-stanna- 1,3-dioxepane (DSDOP) add to equivalents of succinic anhydride by a clean insertion reaction into the Sn-O bonds. The resulting 30- and 17-membered macrocycles are stable up to temperatures around 115°C and do not eliminate Bu 2 SnO in the contrast to literature reports. When succinic or glutaric acid were added to tin-containing macrocyclic poly(e-caprolactone) again no elimination of Bu 2 SnO was observed. After removal of the Bu 2 Sn groups under mild conditions telechelic poly(e-caprolactone)s with two carboxylic endgroups were isolated.
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