Tungestophosphoric Acid supported on highly Organosoluble Polyamide (PW12/PA): Highly Efficient Catalysts for the Synthesis of Novel 1,3,5-Triarylpyrazoline Derivatives

Abstract

A novel compound constructed from polyoxometalate (H₃PW₁₂O₄₀, PW₁₂) and poly(amidoamine) (PA) was prepared at room temperature in an aqueous solution by an impregnation method. A series of novel 1,3,5-triaryl-2-pyrazoline derivatives was synthesized by the reaction between chalcone and phenylhydrazine in the presence of the title compound, PW₁₂/PA, in high yields. The structures of the compounds obtained were determined by IR and ¹H NMR spectra.