Gadolinium Triflate Immobilized in Imidazolium Based Ionic Liquids: A Recyclable Catalyst and Green Solvent for Acetylation of Alcohols and Amines
Gadolinium triflate immobilized in room temperature ionic liquids (RTIL) 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) was found to be a recyclable and green catalyst for acetylation of a variety of alcohols, phenols and amines. Acetylation reactions using acetic anhydride (Ac2O) as the reagent proceeded in excellent yields in the presence of catalytic amounts (0.2-0.5 mol%) of Gd(OTf)3 immobilized in RTILs, at ambient temperature. In addition, the catalyst system Gd(OTf)3/[bmim][X] can be recovered and reused efficiently in these transformations.
R. Alleti et al., "Gadolinium Triflate Immobilized in Imidazolium Based Ionic Liquids: A Recyclable Catalyst and Green Solvent for Acetylation of Alcohols and Amines," Green Chemistry, Royal Society of Chemistry, Apr 2005.
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