Polyaniline supported 12-tungstosilicic acid as the catalyst for acetals and ketals synthesis

Abstract

A novel environmental friendly catalyst, H₄SiW₁₂O₄₀/PAn was prepared and identified by FT-IR, XRD and TG/DTA. The optimal synthetic protocol was a PAn to H₄SiW₁₂O₄₀ mass ratio of 1: 1, a 20 mL of methanol and a reaction time of 2 h at reflux. It was used in catalytic synthesis of ten important ketals and acetals with a high catalytic activity. With an aldehyde/ketone to glycol molar ratio of 1: 1.5 and a 1 wt% catalyst loading, the yields of ketals and acetals could reach 60.0%–93.8 % after 1 h.

Keywords

12-tungstosilicic acid / polyaniline / acetal / ketal / catalysis

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