Journal
EUROPEAN POLYMER JOURNAL
Volume 49, Issue 4, Pages 843-852Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2012.09.017
Keywords
Olefin cross-metathesis thiol-ene; Renewable polyester; Methyl 10-undecenoate; Malonate; Passerini
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Funding
- The German Environmental Foundation (Deutsche Bundesstiftung Umwelt)
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Methyl 10-undecenoate was modified to its corresponding malonate derivative by the reaction with sodium hydride in dimethyl carbonate. This malonate was then polymerized with 1,6-hexanediol, catalyzed by 1.0 mol% titanium (IV) isopropoxide, to a poly(malonate) bearing C-9 aliphatic side-chains with terminal double bonds. The double bonds of this poly(malonate) were used for grafting onto reactions by either ruthenium-catalyzed cross-metathesis reactions with acrylates or thiol-ene addition reactions. Several examples are shown for both methods. For the cross-metathesis reactions, 1.0 mol% Hoveyda-Grubbs 2nd generation (HG II) catalyst was used with 10.0 equivalents of the respective acrylate under bulk conditions at 40 degrees C. The thiol-ene additions were carried out with 1.0 equivalents of the respective thiol in THF with 5.0 mol% 2,2-Dimethoxy-2-phenylacetophenone (DMPA) under UV (365 nm) irradiation. Moreover, we have shown that a carboxylic acid group can be easily installed via thiol-ene addition and that the resulting polymer can be further modified by the Passerini three-component reaction with quantitative conversion. (c) 2012 Elsevier Ltd. All rights reserved.
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