%0 Journal Article
%T ZnAl2O4@SiO2nanocompositecatalystfortheacetylationofalcohols,phenolsandamineswithaceticanhydrideundersolvent-freeconditions
%A Saeed Farhadi
%A Kosar Jahanara
%J ´ß»¯Ñ§±¨
%P 368-375
%D 2014
%R 10.1016/S1872-2067(12)60758-X
%X £¿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.
%K Spinel-typeoxide
%K Zincaluminate
%K Silica
%K Sol-gelprocess
%K Nanocomposite
%K Heterogeneouscatalyst
%K Acetylation
%K Solvent-freecondition
%U http://www.chxb.cn/CN/abstract/abstract21239.shtml