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Synfacts 2008(8): 0888-0888  
DOI: 10.1055/s-2008-1077923
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart ˙ New York

Imidazolium-Based Polymer-Supported Gadolinium Triflate

Contributor(s): Yasuhiro Uozumi, Yoichi M. A. Yamada, Chung Keun Jin
R. Alleti, W. S. Oh, M. Perambuduru, C. V. Ramana, V. P. Reddy*
Missouri University of Scienc and Technology, Rolla and University of Texas at El Paso, USA
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Publication History

Publication Date:
23 July 2008 (online)

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Significance

A heterogeneous Lewis acid catalyst was prepared by incorporating Gd(OTf)3 onto the imidazolium-based polymer 1. 1-Gd(OTf)3 was used for Michael additions of amines to α,β-unsaturated esters (63-98%, 8 examples), thiophenol to α,β-unsaturated esters (98-99%, 2 examples) and amines to acrylonitrile (32-92%, 5 examples). The catalyst was reused twice without loss of catalytic activity (1st use = 98%, 2nd use = 92%, 3rd use = 96%) for the reaction of 2a.