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OALib Journal期刊
ISSN: 2333-9721
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SiO2-Cu2O：AnefficientandrecyclableheterogeneouscatalystforN-benzylationofprimaryandsecondaryamines
DOI: 10.1016/S1872-2067(14)60009-7, PP. 444-450
Keywords: Silicasupportedcopper(I)oxide,Benzylation,Substitutedamine,Recyclability,Heterogeneouscatalysis
Abstract:
？Amild,effective,andselectiveprocedureisreportedforthemonoN-benzylationandN,N-dibenzylationofprimaryaminesaswellasmonoN-benzylationofsecondaryaminesusingsilica-supportedcopper(I)oxideinwater.Thesilica-supportedCu2OwasgeneratedinsitubythereactionofFehlingsolutionandglucoseat100℃ontoactivatedsilica.Thecatalystwasfiltered,washedwithwater,andoven-dried,andwascharacterizedbyFouriertransforminfraredspectroscopy,thermogravimetricanalysis,scanningelectronmicroscopy,transmissionelectronmicroscopy,andatomicabsorptionspectroscopy.ThepreparedCu2O-SiO2wasfoundtobethermallystableupto325℃.Thecopperwasuniformlydistributedontothesurfaceofthesilica,andthemeanparticlediameterwas7nm.ThecatalystservedasaselectiveheterogenouscatalystfortheN-benzylationofprimaryandsecondaryamines.Thecatalystisrecyclableandwasusedeffectivelyuptofifthrunwithoutasignificantlossofcatalyticactivity.Variousreactionsolventsincludingwater,acetonitrile,andtoluenewerescreenedforN-benzylationofamines,andthesuccessoftheaqueoussystemhighlightsthelowenvironmentalimpactoftheprocedure.
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