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

C. Paun, C. Stere, V. I. Parvulescu, P. Goodrich, C. Hardacre

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Heterogeneous immobilized ionic liquid catalysts were prepared via grafting of 1,3-dimethyl-3-(3-triethoxysilylpropyl)-imidazolium tetrafluoroborate or bis{(trifluoromethyl)sulfonyl} imide ([NTf2]-) on silica supports with different surfaces and pore size. In addition to the adsorption-desorption isotherms of nitrogen at -196 °C, 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.

    Original languageEnglish
    Pages (from-to)98-103
    Number of pages6
    JournalCatalysis Today
    Volume131
    Issue number1-4
    DOIs
    Publication statusPublished - 29 Feb 2008

    Keywords

    • Acylation of sulfonamines
    • Immobilized ionic liquid catalysts
    • Silica support

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