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

Dehydrocoupling of phosphine- and amine-boranes is reported using an iron­(II) β-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 i...

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Bibliographic Details
Published in:Organometallics 2017-06, Vol.36 (11), p.2262-2268
Main Authors: Coles, Nathan T, Mahon, Mary F, Webster, Ruth L
Format: Article
Language:English
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Summary:Dehydrocoupling of phosphine- and amine-boranes is reported using an iron­(II) β-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 amido-borane intermediates.
ISSN:0276-7333
1520-6041
DOI:10.1021/acs.organomet.7b00326