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Metal triflates combined with caffeine based imidazolium salts: A new family of highly efficient and reusable catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
52079 46864 2008 5 PDF Available
Title
Metal triflates combined with caffeine based imidazolium salts: A new family of highly efficient and reusable catalysts
Abstract

The direct alkylation of caffeine (1), by ethyl triflate gave 1,3,7-trimethyl-9-ethylxanthinium triflate (2) which led to 1,3,7-trimethyl-9-ethylxanthinium bis(trifluoromethanesulfonyl)amide (3) after methathesis with LiNTf2; 3 proved to be an ionic solid which can be used for the recovery of metal triflates (M(OTf)n with M = Sc, La, Yb, Cu, Hf, Bi). These reusable catalysts proved to be efficient Lewis acids for Diels–Alder reactions leading to very little or no polymerisation of the diene. In the case of bismuth (III) triflate, the catalyst can be recovered and reused at least 10 times without loss of activity.

Keywords
Imidazolium salts; Metal triflates; Catalysis; Diels–Alder reaction; Caffeine
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Metal triflates combined with caffeine based imidazolium salts: A new family of highly efficient and reusable catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 3, 1 March 2008, Pages 465–469
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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