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Acylation of sulfonamines using silica grafted 1-butyl-3-(3-triethoxysilylpropyl)-4,5-dihydroimidazolium ionic liquids as catalysts

✍ Scribed by C. Paun; C. Stere; S.M. Coman; V.I. Parvulescu; P. Goodrich; C. Hardacre

Book ID: 104009737
Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 602 KB
Volume: 131
Category: Article
ISSN: 0920-5861
DOI: 10.1016/j.cattod.2007.10.028

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✦ Synopsis

Heterogeneous immobilized ionic liquid catalysts were prepared via grafting of 1,3-dimethyl-3-(3-triethoxysilylpropyl)-imidazolium tetrafluoroborate or bis{(trifluoromethyl)sulfonyl} imide ([NTf 2 ] À ) on silica supports with different surfaces and pore size. In addition to the adsorption-desorption isotherms of nitrogen at À196 8C, the catalysts were characterized by TG-DTA, XPS, DRIFTS, DR-UV-vis, NMR, and XRD techniques. The catalytic behavior was checked in the acylation of three different sulfonamines: benzenesulfonamine, p-nitrobenzenesulfonamine, and p-methoxybenzene-sulfonamine with acetic acid, acetic anhydride and maleic anhydride. These tests confirmed the acid Lewis properties of these catalysts.

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