Acetylation and oxygenation transformations catalyzed by silica-supported dodecatungstophosphoric acid

Authors: Tayebee, Reza; Rafiee, Ezzat

Source: Bulletin of the Chemical Society of Ethiopia, Volume 20, Number 2, December 2006 , pp. 329-333(5)

Publisher: Chemical Society of Ethiopia

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Abstract:

Acetylation of alcohols in refluxing ethyl acetate, and oxidation of aniline and cyclohexanol with 34 % H₂O₂ in the presence of H₃PW₁₂O₄₀ and its supported forms on SiO₂ (20 %, 40 %, and 60 % by weight) as active solid acid catalysts were performed under mild reaction conditions with moderate to good yields and with 100 % selectivity. It is found that the supported H₃PW₁₂O₄₀ was in general 1.4-2.3 times more efficient than the unsupported catalyst in the acetylation and oxygenation reactions. Easy work-up and effective recycling of the heterogeneous catalyst were distinct advantages of the catalytic heterogeneous system.

Keywords: ACETYLATION; OXYGENATION; DODECATUNGSTOPHOSPHORIC ACID; HETEROGENEOUS; SILICA SUPPORT

Document Type: Short communication

Publication date: 2006-12-01

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