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Issue 17, 2018
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Iridium complexes catalysed the selective dehydrogenation of glucose to gluconic acid in water

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Abstract

We describe an unprecedented catalytic dehydrogenation of glucose by homogeneous catalysts. Iridium(III) complexes containing the fragment [Cp*Ir(NHC)]2+ (NHC = N-heterocyclic carbene ligand) are shown to be very active and highly selective catalysts for the dehydrogenation of glucose to gluconic acid and molecular hydrogen. Glucose is converted to gluconic acid at a catalyst loading of 2 mol%, at reflux in water, without additives and with a selectivity of over 95%. Experimental evidence obtained by 1H NMR spectroscopy and mass spectrometry (ESI/MS) reveals the formation of iridium coordinated to glucose and gluconic acid species. A plausible mechanism is proposed, based on the experimental evidence and supported by DFT calculations.

Graphical abstract: Iridium complexes catalysed the selective dehydrogenation of glucose to gluconic acid in water

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Publication details

The article was received on 21 Jun 2018, accepted on 30 Jul 2018 and first published on 10 Aug 2018


Article type: Paper
DOI: 10.1039/C8GC01933A
Citation: Green Chem., 2018,20, 4094-4101
  • Open access: Creative Commons BY license
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    Iridium complexes catalysed the selective dehydrogenation of glucose to gluconic acid in water

    P. Borja, C. Vicent, M. Baya, H. García and J. A. Mata, Green Chem., 2018, 20, 4094
    DOI: 10.1039/C8GC01933A

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