Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
67763 | Journal of Molecular Catalysis A: Chemical | 2007 | 5 Pages |
Abstract
Efficient one-pot Knoevenagel condensation, Michael addition and cyclodehydration of dimedone with various aldehydes in acetonitrile and solvent free conditions using PPA–SiO2 catalyst gave 1,8-dioxo-octahydroxanthenes 3 in excellent yields; whereas in the presence of HClO4–SiO2 catalyst the reaction is limited to give only 2,2′-arylmethylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) 4 in very good yields. In aqueous medium both HClO4–SiO2 and PPA–SiO2 catalysts yielded only 4 as the product. The scope and limitations of the two catalysts in various reaction conditions examined were described.
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Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Srinivas Kantevari, Rajashaker Bantu, Lingaiah Nagarapu,