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OALib Journal期刊
ISSN: 2333-9721
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ZnAl2O4@SiO2nanocompositecatalystfortheacetylationofalcohols,phenolsandamineswithaceticanhydrideundersolvent-freeconditions
DOI: 10.1016/S1872-2067(12)60758-X, PP. 368-375
Keywords: Spinel-typeoxide,Zincaluminate,Silica,Sol-gelprocess,Nanocomposite,Heterogeneouscatalyst,Acetylation,Solvent-freecondition
Abstract:
？AZnAl2O4@SiO2nanocompositewaspreparedfrommetalnitratesandtetraethylorthosilicatebythesol-gelprocess,andcharacterizedbyX-raydiffraction,Fouriertransforminfrared,transmissionelectronmicroscopy,andN2adsorption-desorptionmeasurements.Thenanocompositewastestedasaheterogeneouscatalystfortheacetylationofalcohols,phenols,andaminesundersolvent-freeconditions.Underoptimizedconditions,efficientacetylationofthesesubstrateswithaceticanhydrideovertheZnAl2O4@SiO2nanocompositewasobtained.Acetylationofanilinesandprimaryaliphaticaminesproceededrapidlyatroomtemperature,whilethereactiontimewaslongerfortheacetylationofalcoholsandphenols,showingthatanamineNH2groupcanbeselectivelyacetylatedinthepresenceofalcoholicorphenolicOHgroups.Thecatalystcanbereusedwithoutobviouslossofcatalyticactivity.ThecatalyticactivityoftheZnAl2O4@SiO2nanocompositewashigherthanthatofpureZnAl2O4.Themethodgiveshighyields,andisclean,costeffective,compatiblewithsubstrateshavingotherfunctionalgroupsanditissuitableforpracticalorganicsynthesis.
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