ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Sulfonated Honeycomb Coral (HC-SO₃H): a new, green and highly efficient heterogeneous catalyst for the rapid one-pot pseudo-five component synthesis of 4,4′-(aryl methylene) bis(3-methyl-1H-pyrazol-5-ol)s

Roya Jahanshahi and Batool Akhlaghinia

Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran

E-mail: akhlaghinia@um.ac.ir

Abstract: Sulfonated Honeycomb Coral (HC-SO₃H), has been synthesized from the reaction of Honeycomb Coral with chlorosulfonic acid as sulfonating agent. The as-synthesized catalyst was characterized via XRF, FT-IR, TGA, SEM–EDS, XRD, BET and pH analysis. The superior catalytic activity of HC-SO₃H was investigated for the synthesis of 4,4′-(aryl methylene)bis(3-methyl-1H-pyrazol-5-ol) derivatives through the one-pot pseudo-five component reactions. The main advantages of this protocol include simple procedure, excellent yields and short reaction times besides the non-toxicity, high stability and reusability of the catalyst.

Keywords: Sulfonated Honeycomb Coral (HC-SO₃H), 4,4′-(Aryl methylene)bis(3-methyl-1H-pyrazol-5-ol)s, One-pot pseudo-five component reaction, Heterogeneous catalysis, Green chemistry

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-016-0127-y

Chemical Papers 71 (7) 1351–1364 (2017)