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SulfuricAcid([3-(3-Silicapropyl)sulfanyl]propyl)esterasaRecyclableCatalystfortheSynthesisof4,4'-(Arylmethylene)bis(1H-pyrazol-5-ols)
DOI: 10.1016/S1872-2067(10)60260-4
Keywords: sulfuricacid([3-(3-silicapropyl)sulfanyl]propyl)ester ,silica-bondedN-propylsulfamicacid ,3-methyl-l-phenyl-5-pyrazolone ,aldehydes
Abstract:
？Sulfuricacid([3-(3-silicapropyl)sulfanyl]propyl)esterisemployedasarecyclablecatalystforthecondensationreactionbetweenaromaticaldehydesand3-methyl-l-phenyl-5-pyrazolone.Thiscondensationreactionwasperformedinethanolunderrefluxingconditionsgiving4,4'-alkylmethylene-bis(3-methyl-5-pyrazolones)in74-90%yields.Theheterogeneouscatalystwasrecycledandusedinelevenrunsforthereactionbetweenbenzaldehydeand3-methyl-l-phenyl-5-pyrazolonewithoutlosingcatalyticactivity.
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