PVPP-p-TSA catalyzed one-step synthesis of novel aryldiazenyl-2-hydroxybenzylidene-cyanoarylhydrazide analogs

Abstract

In this research, an efficient process for the preparation of new aryldiazenyl-2-hydroxybenzylidene-cyanoarylhydrazide analogs was developed through the reaction of 2‑hydroxy-5-(aryldiazenyl)benzaldehyde, acetophenone analogs and cyanoacetohydrazide using polyvinylpolypyrrolidone immobilized p-toluene sulfonic acid (PVPP-p-TSA) as a heterogeneous catalyst in ethanol at reflux conditions. All products were characterized by FT-IR, 1HNMR , 13CNMR and Mass spectroscopy mhetods. PVPP-p-TSA was identified by FT-IR, SEM, EDX, TEM and TGA techniques. Clean method, easy catalyst manufacturing, and high efficiency are the advantages of this procedure. Furthermore, our results demonstrated that the catalyst can be reused four times without considerable loss of its stability or structural change.