期刊
RSC ADVANCES
卷 6, 期 80, 页码 76707-76715出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra14594a
关键词
-
资金
- National Natural Science Foundation of China [21406166]
- US Department of Energy [DE-FG02-10ER16193]
Six Na+/montmorillonite (MMT) - supported thiazolium (TM) ionic liquids (ILs), MMT-[TM], which are precatalysts to N-heterocyclic carbene (NHC) catalysts, have been synthesized and employed to catalyze the highly selective condensation of furfural (FF) and 5-hydroxymethylfurfural (HMF) into C-10 and C-12 furoins, respectively. Among them, five supported [TM] salts carrying the electron-donating group exhibit excellent catalytic activity. Thus, supported NHC catalysts, generated in situ from activation of MMT-[TM] with Et3N, afford C-10 and C-12 furoins in 97-99% and 97-98% yield, respectively. This condensation reaction is also carried out under solvent-free conditions, and the catalysts can be readily recycled, showing no noticeable loss in their catalytic activity over four consecutive recycles. Thus, these desired features possessed by the current catalyst system have enabled the development of the greener and more environmentally benign process for the upgrading of FF and HMF.
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