Abstract

Ramyah Radman^*, Ahmed Aouissi, and Wafa Mekhamer

DOI : http://dx.doi.org/10.13005/ojc/310455

A series of keggin-type polyoxometalatesnamely; H₃PMo₁₂O₄₀,H₃PW₁₂O₄₀, Fe_1.5PW₁₂O₄₀ and Co_1.5PW₁₂O₄₀ were prepared, characterized and tested for the oxidation of cyclohexene by molecular oxygen in acetonitrile medium. The oxidation gives 2-cyclohexen-1-ol, 2-cyclohexen-1-one and cyclohexene oxide,however, 2-cyclohexen-1-one was the major product.TheCo_1.5PW₁₂O₄₀catalyst showed the highest catalytic activity for the oxidation reactionand it was chose to study the effect ofvaryingO₂ pressure, time, temperature and catalyst weight. The highest percentage of cyclohexen econ version and selectivity of the major product 2-cyclohexen-1-one was obtained at 5bar of O₂ pressure, 4h, 70 ^oC, and 900mg of Co_1.5PW₁₂O₄₀ catalyst.

Polyoxometalate; cyclohexene; molecular oxygen; catalytic oxidation; Reaction conditions

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