Extending the chemistry of disilene fluoride adducts studied earlier by us, we investigated the formation of 1,1-bis(trimethylsilyl)fluorodiphenylsilylsilanide, which was prepared by reaction of (MeSi)SiSiPhF with KOBu. The formed FPhSiSi(MeSi)K displays distinctively different structural and spectroscopic features compared to the earlier reported F(MeSi)SiSi(SiMe)K. While the latter eliminates metal fluoride upon reaction with MgBr, the respective magnesium silanide is formed from FPhSiSi(MeSi)K. Reaction of (MeSi)SiSiPhCl with KOBu proceeded similarly, but the formed ClPhSiSi(MeSi)K easily undergoes potassium chloride elimination to the disilene PhSi═Si(SiMe). Compared to F(MeSi)SiSi(SiMe)K, which can be regarded as a disilene fluoride adduct, structural, spectroscopic, and reactivity properties of FPhSiSi(MeSi)K distinguish it as a β-fluorodisilanide.
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