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

Reusable palladium–quinolyl benzimidazole complex immobilized on a polymer for the hydrogenation of organic substrates

Shilpa Madhugiri Lakshminarayana, Roopashree Boregowda, and Gayathri Virupaiah

Department of Studies in Chemistry, Central College Campus, Bangalore University, Bengaluru, India

E-mail: gayathritvr@yahoo.co.in

Received: 19 June 2022  Accepted: 8 February 2023

Abstract:

2-(2’-quinolyl) benzimidazole (QBIMH) anchored on to the crosslinked polymer beads of chloromethylated poly (styrene-co-divinyl benzene) (PSDVB) was reacted with sodium tetrachloropalladate (Na₂PdCl₄) to form polymer-supported palladium complex. The immobilized palladium complex was treated with sodium borohydride and activated. Multifarious approach supported the characterization of polymer-anchored [2-(2’-quinolyl) benzimidazole]palladium complex (PSDVB-QBIM-PdCl₂) and its activated form. The optimal activated complex catalyzed the hydrogenation of olefins, Schiff bases and nitro compounds under ambient conditions. The kinetic studies were carried out for the hydrogenation of certain olefins. The recycling ability of the supported and the unsupported catalysts was showcased.

Keywords: Hydrogenation; Polymer-supported palladium (II) complex; Selectivity; Kinetics; Rate equation; Recycling efficiency

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-02721-7

Chemical Papers 77 (7) 3589–3601 (2023)