Anionic Ring-Opening Polymerization of beta-Alkoxymethyl-Substituted beta-Lactones

摘要

We report on anionic ring-opening polymerization (ROP) of racemic beta-(memoxymethyl)-beta-propiolactone (MOMPL) and beta-(ethoxymethyl)-beta-propiolactone (EOMPL) initiated by supramolecular complex of potassium acetate and tetrabutylammonium acetate (Bu4N~+Ac) as well as by tetrabutylammonium hydroxide,respectively.Structure of the resulting polymers has been established at the molecular level by electrospray ionization multistage mass spectrometry (ESl-MS~n) and has been confirmed by FT-IR,NMR,and GPC analyses.Similar behavior of MOMPL and EOMPL with respect to already-studied beta-alkyl-substituted beta-lactones,e.g.,beta-butyrolactone (MPL),has been observed under the conditions of anionic ROP (including observed side reactions leading to unsaturated end groups) and the already-established mechanisms of anionic polymerization of beta-alkyl-substituted beta-lactones are extended on beta-alkoxymethyl-substituted ones.