Polymer-Supported Palladium(II) Carbene Complexes: Catalytic Activity, Recyclability, and Selectivity in C-H

Maitham H Majeed¹, Payam Shayesteh², L Reine Wallenberg^1,3

¹Centre for Analysis snd Synthesis, Department of Chemistry, Lund University, Box 124, 221 00, Lund, Sweden.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|April 20, 2017

Abstract:

Heterogeneous catalysts for selective oxidation of C-H bonds were synthesized by co-polymerization of new N-heterocyclic carbene-palladium(II) (NHC-Pd^II ) monomers with divinylbenzene. The polymer-supported NHC-Pd^II -catalysed undirected C-H acetoxylation of simple and methylated arenes as well as polyarenes, with similar or superior efficiency compared to their homogeneous analogues. In particular, the regioselectivity has been improved in the acetoxylation of biphenyl and naphthalene compared to the best homogeneous catalysts. The new polymer-supported catalysts maintain the original oxidation state of Pd^II after repeated catalytic reactions, and exhibit no significant leaching of palladium. In addition, the new catalysts have been successfully recovered and reused without loss of activity over several cycles of reactions.

Keywords:

C−H activation N-heterocyclic carbenes palladium(II)polymer supported Pd(II)undirected acetoxylation

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Abstract:

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