5 years ago

A Fully Phosphane-Substituted Disilene

A Fully Phosphane-Substituted Disilene
Keith Izod, Peter Evans, Paul G. Waddell
There is growing interest in compounds containing functionalized E=E multiple bonds (E=Si, Ge, Sn, Pb) because of their potential to exhibit novel physical and chemical properties. However, compounds containing multiple functionalizations are rare, with scarcity increasing with increasing degree of substitution. The first ditetrelene R2E=ER2 in which the E=E bond is substituted by four heteroatoms (other than Si) is described. The tetraphosphadisilene {(Mes)2P}2Si=Si{P(Mes)2}2 (7) is readily isolated from the reaction between SiBr4 and [(Mes)2P]Li, the latter of which acts as a sacrificial reducing agent. The structure of 7 is presented, while the bonding in, and stability of 7 were probed using DFT calculations. The tetraphosphadisilene compound {(Mes)2P}2Si=Si{P(Mes)2}2 is a readily accessible complex that is stable in the solid state, and is unlike tetraaminodisilenes (R2N)2Si=Si(NR2)2, which are typically unstable with respect to their silylene monomers (R2N)2Si. Tetraphosphadisilene is the first structurally characterized example of a ditetrelene substituted by more than two heteroatoms other than silicon.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201701867

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