期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2015, 期 13, 页码 2791-2795出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201500313
关键词
Cooperative catalysis; Polymers; Amines; Cyclic carbonates; Polyurethane
资金
- Northwestern University
- Dow Chemical Company
The reaction between cyclic carbonates and amines to produce hydroxyurethanes is an important alternative to current urethane chemistry. In order to address the issue of slow reaction rates, an efficient ring opening of cyclic carbonates with amines has been achieved utilizing cooperative catalysis. A new Lewis acid/Lewis base combination substantially decreases the reaction times for small molecule systems to reach complete conversion. Although triazabicyclodecene (TBD) has a substantial impact on the reaction rate, the addition of lithium triflate (LiOTf) as a co-catalyst allows for the fastest ring opening reported in the current literature. Cooperative catalysis is also applied to the synthesis of polymers containing hydroxyurethane linkages and is able to achieve rapid conversion of the bis-cyclic carbonate and diamine precursors when compared with the uncatalyzed reaction.
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