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

Synthesis and characterization of chitosan pyridyl imine palladium (CPIP) complex as green catalyst for organic transformations

Narendra Singh Chundawat, Sultan Pathan, Girdhar Pal Singh, Arup Saha Deuri, Payam Zarrintaj, and Narendra Pal Singh Chauhan

Department of Chemistry, Faculty of Science, Bhupal Nobles’University, Udaipur, India

E-mail: narendrapalsingh14@gmail.com

Received: 17 September 2020  Accepted: 19 January 2021

Abstract:

In this work, the modification of chitosan using 2-acetyl pyridine has been used to prepare an intermediate, chitosan pyridyl imine (CPI), in first step and then in second step it is further reacted with Pd(OAc)₂ to develop chitosan pyridyl imine palladium (CPIP) complex catalyst in a very simplistic way. The formed CPIP has been extensively characterized with respect to raw chitosan utilizing methods including FT-IR, pyrolysis GC–MS, XRD, XPS, FE-SEM, EDS, TGA-DTG and DSC. TG-DSC study suggested that the catalyst is thermally stable up to 300 °C. This catalyst shows an excellent activity in the reduction of toxic pollutant nitrobenzene to less toxic aniline. CPIP complex has also been found to give magnificent results in Suzuki–Miyaura and Heck cross-coupling reactions, and therefore, using this green catalyst, the toxic phosphine ligand can be excluded from cross-coupling reactions. This study furnishes an economic and eco-friendly catalyst for organic transformation in sustainable chemistry.

Keywords: Chitosan; Pyridyl; Characterization; Palladium catalyst; Suzuki; Heck reaction; Reduction; Azo dye

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01526-w

Chemical Papers 75 (6) 2835–2850 (2021)