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γ-Alumina as a recyclable catalyst for the four-component synthesis of 6-amino-4-alkyl/aryl-3-methyl-2,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles in aqueous medium

Chemical EngineeringAqueous MediumEngineeringFour-component SynthesisRecyclable CatalystOrganic ChemistryCatalysisChemistrySynthesis MethodCatalytic Synthesis