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

• A novel series of aryldiazenyl-2-hydroxybenzylidene-cyanoarylhydrazide were synthesized and characterized by different spectroscopic techniques. • Polyvinylpolypyrrolidone immobilized p -toluene sulfonic acid (PVPP- p -TSA) prepared and characterized by FT-IR, SEM, EDX, TEM and TGA techniques. • High yields and easy work-up procedure are some advantages of this procedure. 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. [Display omitted] [ABSTRACT FROM AUTHOR]