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Highly active, separable and recyclable bipyridine iridium catalysts for C–H borylation reactions

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Abstract

Iridium complexes generated from Ir(I) precursors and PIB oligomer functionalized bpy ligands efficiently catalyzed the reactions of arenes with bis(pinacolato)diboron under mild conditions to produce a variety of arylboronate compounds. The activity of this PIB bound homogeneous catalyst is similar to that of an original non-recyclable catalyst which allows it to be used under milder conditions than other reported recyclable catalysts. This oligomer-supported Ir catalyst was successfully recovered through biphasic extraction and reused for eight cycles without a loss of activity. Biphasic separation after the initial use of the catalyst led to an insignificant amount of iridium leaching from the catalyst to the product, and no iridium leaching from the catalyst was observed in the subsequent recycling runs. Arylboronate products obtained after extraction are sufficiently pure as observed by 1H and 13C-NMR spectroscopy that they do not require further purification.

Graphical abstract: Highly active, separable and recyclable bipyridine iridium catalysts for C–H borylation reactions

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Publication details

The article was received on 11 Aug 2017, accepted on 01 Nov 2017 and first published on 01 Nov 2017


Article type: Communication
DOI: 10.1039/C7CY01641G
Citation: Catal. Sci. Technol., 2017, Advance Article
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    Highly active, separable and recyclable bipyridine iridium catalysts for C–H borylation reactions

    H. Mamlouk, J. Suriboot, P. K. Manyam, A. AlYazidi, D. E. Bergbreiter and S. T. Madrahimov, Catal. Sci. Technol., 2017, Advance Article , DOI: 10.1039/C7CY01641G

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