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An environmental friendly, one pot, four components ZnS nanoparticles (NPs) catalyzed synthesis of biologically important spiropolyhydroquinoline derivatives in water under ultrasonic irradiation is described. The four component reaction of substituted cyclic ketones, 5,5-dimethyl-1,3-cyclohexanedione, meldrum’s acid, and amines/ammonium acetate in which formation of multiple carbon–carbon bonds occurs...
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