4.5 Article

Phosphine- and Amine-Borane Dehydrocoupling Using a Three-Coordinate Iron(II) β-Diketiminate Precatalyst

期刊

ORGANOMETALLICS
卷 36, 期 11, 页码 2262-2268

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AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.7b00326

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  1. University of Bath
  2. EPSRC [EP/M019810/1, EP/P024254/1] Funding Source: UKRI
  3. Engineering and Physical Sciences Research Council [EP/P024254/1, EP/M019810/1, 1646537] Funding Source: researchfish

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Dehydrocoupling of phosphine- and amine-boranes is reported using an iron(II) beta-diketiminate complex. Dehydrocoupling of amine-boranes is far more facile than the phosphine counterpart, the former proceeding at room temperature with 1 mol% iron precatalyst. This low loading is sufficient to allow in situ kinetic analysis and deuterium labeling studies to be carried out. An iron amido-borane complex has also been isolated, which is believed to be the catalyst resting state. Overall, this has allowed us to postulate a catalytic cycle which proceeds via release of diborazane, iron hydride, and iron amidoborane intermediates.

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