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Isolation of Neutral, Mono‐, and Dicationic B(2)P(2) Rings by Diphosphorus Addition to a Boron−Boron Triple Bond
The NHC‐stabilised diboryne (B(2)(SIDep)(2); SIDep=1,3‐bis(2,6‐diethylphenyl)imidazolin‐2‐ylidene) undergoes a high‐yielding P−P bond activation with tetraethyldiphosphine at room temperature to form a B(2)P(2) heterocycle via a diphosphoryldiborene by 1,2‐diphosphination. The heterocycle can be oxi...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8252364/ https://www.ncbi.nlm.nih.gov/pubmed/33844394 http://dx.doi.org/10.1002/anie.202102218 |
Sumario: | The NHC‐stabilised diboryne (B(2)(SIDep)(2); SIDep=1,3‐bis(2,6‐diethylphenyl)imidazolin‐2‐ylidene) undergoes a high‐yielding P−P bond activation with tetraethyldiphosphine at room temperature to form a B(2)P(2) heterocycle via a diphosphoryldiborene by 1,2‐diphosphination. The heterocycle can be oxidised to a radical cation and a dication, respectively, depending on the oxidant used and its counterion. Starting from the planar, neutral 1,3‐bis(alkylidene)‐1,3‐diborata‐2,4‐diphosphoniocyclobutane, each oxidation step leads to decreased B−B distances and loss of planarity by cationisation. X‐ray analyses in conjunction with DFT and CASSCF/NEVPT2 calculations reveal closed‐shell singlet, butterfly‐shaped structures for the NHC‐stabilised dicationic B(2)P(2) rings, with their diradicaloid, planar‐ring isomers lying close in energy. |
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