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

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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.

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Acknowledgements

Authors wish to thank UGC, New Delhi, India, for Major Research Project [F no. 39-741/2010(SR)]. Department of Chemistry, Bangalore University, Bengaluru, for instrumentation facilities and Thermax Ltd. for providing PSDVB are gratefully acknowledged. Roopashree B thanks Management and Principal, JSS Academy of Technical Education, Bengaluru, for the encouragement. Authors are grateful to Dr. M.S.Hegde, IISc., Bengaluru, for XPS studies and Prof. Puttaswamy, Dept. of Studies in Chemistry, Bangalore University, Bangalore, for his kind help in deriving rate law equation.

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Correspondence to Gayathri Virupaiah.

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On behalf of all authors, I, Dr. Gayathri Virupaiah, corresponding author states that there is no conflict of interest.

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Lakshminarayana, S.M., Boregowda, R. & Virupaiah, G. Reusable palladium–quinolyl benzimidazole complex immobilized on a polymer for the hydrogenation of organic substrates. Chem. Pap. 77, 3589–3601 (2023). https://doi.org/10.1007/s11696-023-02721-7

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  • DOI: https://doi.org/10.1007/s11696-023-02721-7

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