Abstract

RAFIEE, Ezzat  and  KAHRIZI, Masoud. Cesium salts of phosphotungstic acid: Comparison of surface acidity, leaching stability and catalytic activity for the synthesis of β-ketoenol ethers. S.Afr.j.chem. (Online) [online]. 2013, vol.66, pp.00-00. ISSN 1996-840X.

Catalytic activity of Cs_xH₃-_xPW₁₂O₄₀ catalysts were investigated in the synthesis of β-ketoenol ethers. It was found that activity; acidity, solubility and consequently, recoverability of these catalysts are related to cesium content. A series of β-ketoenol ether derivatives were synthesized by using Cs₂₅H_0.5PW₁₂O₄₀ catalyst in high to excellent yields. This catalyst showed highest surface acidity and lowest solubility in reaction media in comparison with the other cesium content salts.

Keywords : Polyoxometalates; cesium salts; surface acidity; β-ketoenol ethers; heterogeneous catalysis.

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