Pandey, J.K. (2015) Aerobic Baeyer–Villiger oxidation of cyclic ketones over periodicmesoporous silica Cu/Fe/Ni/Co-HMS-X. Applied Catalysis A: General , 505. pp. 515-523. ISSN 0926-860X

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Baeyer–Villiger oxidation is important reaction in the organic synthesis for designing value added lac-tone/esters from the respective carbonyl compounds. Usually an active metal-containing material in the presence of peroxides catalyzes this reaction. Here highly ordered metal promoted periodic mesoporous silica with high surface area has been synthesized hydrothermally by the sol–gel method and thoroughly characterized by surface area and porosity measurements, SAXS, FESEM, HRTEM, FTIR, UV–Vis, NH3-TPDand XRD techniques. Liquid phase Baeyer–Villiger oxidation of ketones to the corresponding esters have been carried out using molecular oxygen as an oxidant, benzaldehyde as the sacrificing agent over Co-HMS-X and M-Co-HMS-X (metal = Ni, Fe, Cu) as catalysts. The obtained results demonstrate that among the three promoted catalyst, i.e. Ni-Co-HMS-X, Cu-Co-HMS-X and Fe-Co-HMS-X, Ni promoted catalyst is a promising and efficient catalyst with high catalytic activity (>99% cyclohexanone conversion and >99% _-caprolactone selectivity) for the oxidation of cyclohexanone to _-caprolactone. The high catalytic activity is attributed to the Ni on the wall of mesoporous silica along with cyclohexanone, which results in suc-cessful completion of the oxygen transfer step and generation of _-caprolactone. Interesting information regarding cooperative role of cobalt and nickel towards catalytic activity is observed.

Item Type: Article
Uncontrolled Keywords: Mesoporous silica; Reductant; Molecular O2; Cyclohexanone ;_-Caprolactone
Subjects: Respiratory Protection Laboratory
Depositing User: Mr. B. R. Panduranga
Date Deposited: 01 May 2017 04:27
Last Modified: 01 May 2017 04:27

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