Significant Heterogeneous Carbonate Salt Catalyzed Acetylation of Alcohols via a Transesterification Process with Carbonate Salt-activated Alcohol 1H NMR Evidence.pdfVIP
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Significant Heterogeneous Carbonate Salt Catalyzed Acetylation of Alcohols via a Transesterification Process with Carbonate Salt-activated Alcohol 1H NMR Evidence.pdf
FULLPAPER
SignificantHeterOgeneousCarbonateSaltCatalyzed
AcetylationofAlcoholsviaaTranSeSterⅢcationProcesswith
CarbonateSalt.activatedAlcohol’HNMREvidence
Xiong,Yan(熊燕) Zhang,Xueqiang(张学强)
CollegeofChemistryandChemicalEngineering,ChongqingUniversity,Chongqing400030,China
Heterogeneouscarbonatesaltcatalyzedacet)lationofalcoholsviaatransesterificationprocesshasbeendevel—
oped.VariousestersarefurnisheduDto97% yield.Establishedprocedureissimpleandair—tolerantwithreadily
avai1ablereagents.Ethylacetateandisobutylacetateareusedasnotonlyacetylatingagents.butalsoreactionsol—
ventsintransesterification.Aliphaticlinera alcohols.allylicalcoholsandbenzy1alcoholsshow highreactivitiesin
thepresenceoflor5mo1% Cs2CO3at125 ℃ .Cesium crabonatecna berecycledbypumpingliquidphaseoutof
reactorafterreaction.During fourcyclerunsforreactionof2.phenylethnaoland ethylacetate.high yieldsof
phenethylacetateraeprovidedf60%yield).Basedonexperimentsnad HNMRinvestigafton.bifunctionalca.
talysisisproposed,alcoholactivatedbycarbonateionisconfirmed.andhigheractivityofcatalyticamountthan
stoichiometriccesium carbonateisinterpreted.
Keywords acetylation,alcohols,cesium carbonate,ester,NM Rna alysis,transesterification
Introduction toeffectivelycatalyzehtetransesterificatiOn.butBrCn—
stedacidorbasecatalystisstronglycorrosivetofacility,
Theestermoiety isacommonfunctionalgroup in
especiallyinindustry.UtilizingBrCnstedbasecatalysts
drugsand naturalproducts,and sometimes,the ester
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