Disilene Fluoride Adducts versus β-Halooligosilanides

Article abstract of DOI:10.1021/acs.inorgchem.9b02223

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 (Me₃Si)₃SiSiPh₂F with KO^tBu. The formed FPh₂SiSi(Me₃Si)₂K displays distinctively different structural and spectroscopic features compared to the earlier reported F(Me₃Si)₂SiSi(SiMe₃)₂K. While the latter eliminates metal fluoride upon reaction with MgBr₂, the respective magnesium silanide is formed from FPh₂SiSi(Me₃Si)₂K. Reaction of (Me₃Si)₃SiSiPh₂Cl with KO^tBu proceeded similarly, but the formed ClPh₂SiSi(Me₃Si)₂K easily undergoes potassium chloride elimination to the disilene Ph₂SiSi(SiMe₃)₂. Compared to F(Me₃Si)₂SiSi(SiMe₃)₂K, which can be regarded as a disilene fluoride adduct, structural, spectroscopic, and reactivity properties of FPh₂SiSi(Me₃Si)₂K distinguish it as a β-fluorodisilanide.