Amine-Borane Dehydrogenation and Transfer Hydrogenation Catalyzed by α-Diimine Cobaltates |
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| Authors: | Thomas M Maier Sebastian Sandl Dr Ilya G Shenderovich Prof?Dr Axel Jacobi?von?Wangelin Prof?Dr Jan J Weigand Prof?Dr Robert Wolf |
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| Institution: | 1. Institute of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany;2. University of Regensburg, Institute of Organic Chemistry, 93040 Regensburg, Germany;3. TU Dresden, Faculty of Chemistry and Food Chemistry, Chair of Inorganic Molecular Chemistry, 01062 Dresden, Germany |
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| Abstract: | Anionic α-diimine cobalt complexes, such as K(thf)1.5{(DippBIAN)Co(η4-cod)}] ( 1 ; Dipp=2,6-diisopropylphenyl, cod=1,5-cyclooctadiene), catalyze the dehydrogenation of several amine-boranes. Based on the excellent catalytic properties, an especially effective transfer hydrogenation protocol for challenging olefins, imines, and N-heteroarenes was developed. NH3BH3 was used as a dihydrogen surrogate, which transferred up to two equivalents of H2 per NH3BH3. Detailed spectroscopic and mechanistic studies are presented, which document the rate determination by acidic protons in the amine-borane. |
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| Keywords: | amine-boranes catalysis cobalt dehydrogenation transfer hydrogenation |
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