The <i>bis</i>(Biphenyl)phosphorus Fragment in Trivalent and Tetravalent P-Environments
Diaryl substituted phosphorus (III) compounds are commonly used motifs in synthesis. Although the basic synthetic routes to these molecules starting from PCl<sub>3</sub> are well reported, sterically hindered aryl substituents can be difficult to introduce, especially if the P atom is in...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/28135832c06b4a4b88615bc99d551759 |
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| Sumario: | Diaryl substituted phosphorus (III) compounds are commonly used motifs in synthesis. Although the basic synthetic routes to these molecules starting from PCl<sub>3</sub> are well reported, sterically hindered aryl substituents can be difficult to introduce, especially if the P atom is in <i>ortho</i> position to another group. This work explores the chemistry of the <i>bis</i>(biphenyl)phosphorus(III) fragment. As third substituents, H, M, Cl, NR<sub>2</sub>, two group 14 element substituents and also Li were introduced in high-yielding processes offering a wide chemical variety of the <i>bis</i>(biphenyl) phosphine motif. In addition, also a tetravalent phosphine borane adduct was isolated. All structures were thoroughly investigated by heteronuclear NMR spectroscopic analysis. Furthermore, the reaction conditions are discussed in connection with the structures and four crystal structures of the aminophosphine, phosphine, phosphine borane and phosphide are provided. The latter crystallized as a dimer with a unique planar P<sub>2</sub>Li<sub>2</sub> ring, which is stabilized by the non-covalent C⋯Li interaction arising from the biphenyl motif and represents a rare example of a donor-free planar P<sub>2</sub>Li<sub>2</sub> ring. |
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