Journal
CHEMICAL SCIENCE
Volume 11, Issue 3, Pages 862-869Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc05969e
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Funding
- EPSRC
- University of Oxford
- CAPES (Coordination for the Improvement of Higher Education Personnel) [88881.188450/2018-01]
- UK EPSRC [EP/L011972/1]
- EPSRC [EP/J013501/1, EP/L011972/1, EP/M027732/1, 1811539] Funding Source: UKRI
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We report on the (tert-butyl)isocyanide-catalysed isomersation of a phosphaethynolato-borane, [B]OCP ([B] = N,N '-bis(2,6-diisopropylphenyl)-2,3-dihydro-1H-1,3,2-diazaboryl), to its linkage isomer, a phosphaketenyl-borane, [B]PCO. Mechanistic insight into this unusual isomerisation was gained through a series of stoichiometric reactions of [B]OCP with isocyanides and theoretical calculations at the Density Functional Theory (DFT) level. [B]PCO decarbonylates under photolytic conditions to afford a novel boryl-substituted diphosphene, [B]PP[B]. This reaction proceeds via a transient triplet phosphinidene which we have been able to observe spectroscopically by Electron Paramagnetic Resonance (EPR) spectroscopy.
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