| Abstract
| - Starting from hexachloro- or hexabromodisilane a wide variety of 1,2-disubstituted tetrachlorodisilanes (RSiCl2SiCl2R) [R = Cp* (2a), 4-iPrC6H4(SiMe3)N (2b), 2,6-iPr2C6H3(SiMe3)N (2c), (Me3Si)2CH (2d) (Me3Si)3C (2e),(Me3Si)3Si (2f)], tetrabromodisilanes (RSiBr2SiBr2R) [R = Cp* (3a), 4-iPrC6H4(SiMe3)N (3b), (Me3Si)3Si (3f)]and the monosubstituted pentahalogenodisilanes Cp*SiX2SiX3 [X = Cl (4), Br (5)] were prepared. Thetetrachlorodisilanes 2a−e are converted to various functionalized disilanes. Ammonolysis of 2a−e leads to thetetraaminodisilanes [RSi(NH2)2Si(NH2)2R] 6a−e. A reduction of 2d with LiAlH4 resulted in the formation of thedisilane RSiH2SiH2R [R = (Me3Si)2CH] 7 and the metathesis with Me3SnF yielded the tetrafluorodisilane RSiF2SiF2R [R = (Me3Si)2CH] 8. Treatment of 6d with reagents containing H acidic protons (HX) [X = Br, I and OH]leads under elimination of NH3 to the tetrabromo- R2SiBr2SiBr2R (3d) tetraiodo- RSiI2SiI2R (9) and thetetrahydroxodisilane RSi(OH)2Si(OH)2R (10) [R = (Me3Si)2CH]. Single-crystal X-ray structural analysis of 2d,6a, 6d, and 9 are reported.
- Several derivates of tetrachlorodisilanes and tetrabromodisilanes with various ligands in 1,2-position were prepared by different routes. The fluorination with Me3SnF leads to a tetrafluorodisilane, and the reaction with LiAlH4 gives the expected hydrogen-containing product. The ammonolysis of the tetrachlorodisilane leads to the corresponding tetraaminodisilane. One of the tetraaminodisilanes was converted using reagents containing H acidic protons. The reaction with water gives the tetrahydroxydisilane and HBr and HI, respectively, lead to the corresponding tetrabromo- and tetraiododisilane. Single-crystal X-ray structural analysis of the chlorine, iodine, and amine derivatives are reported. The tetraaminodisilane is shown here with two different conformers.
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