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Catalytic activity of a supported palladium–benzimidazole complex toward alkene hydrogenation

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Abstract

A polymer anchored palladium complex was synthesized by sequential attachment of benzimidazole and palladium chloride to chloromethylated polystyrene divinyl benzene co-polymer with 6.5 % cross-linking. The product was characterized by XPS, UV–vis. spectrophotometry, FTIR and TGA. Various physico-chemical properties such as bulk density, surface area and swelling behavior in different solvents were also measured. The polymer anchored complex was tested as a catalyst for reduction of olefins. The kinetics of hydrogenation of 1-hexene was studied by varying the temperature, catalyst concentration and substrate concentration. The energy and entropy of activation were evaluated from the kinetic data. The catalyst could be recycled a number of times and no leaching of metal from the catalyst surface was observed.

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Scheme 1
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Abbreviations

PSDVB:

Chloromethylated polystyrene divinyl benzene

PSDVB-BzlH:

Benzimidazole Functionalized beads

PSDVB-BzlH-PdCl2 :

Functionalized beads with PdCl2

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Acknowledgments

The authors would like to thank UGC for DRS programme, Prof. Sadashiva, Liquid Crystal Lab. RRI for CHN analysis and DST, Central Facility, Physics Department, I.I.Sc. Bangalore for recording far-IR spectra. Thermax India Ltd. for providing chloromethylated poly(styrene–divinylbenzene) beads.

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  1. Department of Chemistry, Bangalore University, Central College Campus, Bangalore, 560 001, India

    S. Alexander, V. Udayakumar & V. Gayathri

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  1. S. Alexander
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  2. V. Udayakumar
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  3. V. Gayathri
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Correspondence to V. Gayathri.

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Alexander, S., Udayakumar, V. & Gayathri, V. Catalytic activity of a supported palladium–benzimidazole complex toward alkene hydrogenation. Transition Met Chem 37, 367–372 (2012). https://doi.org/10.1007/s11243-012-9597-0

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