Syntheses and crystal structures of 
bis()N-lithiotrimethylsilylamino)bis(dimethylamino)silane and 
1,1-dichloro-2,4-bis(trimethylsilylamino)-3,3-bis(dimethylamino)siladiazatitanacyclo-butane

Engering, J.; Peters, E.-M.; Jansen, M.

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Syntheses and crystal structures of bis()N-lithiotrimethylsilylamino)bis(dimethylamino)silane and 1,1-dichloro-2,4-bis(trimethylsilylamino)-3,3-bis(dimethylamino)siladiazatitanacyclo-butane

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Engering, J.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Peters, E.-M.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen, M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Engering, J., Peters, E.-M., & Jansen, M. (2002). Syntheses and crystal structures of bis()N-lithiotrimethylsilylamino)bis(dimethylamino)silane and 1,1-dichloro-2,4-bis(trimethylsilylamino)-3,3-bis(dimethylamino)siladiazatitanacyclo-butane. Zeitschrift für Naturforschung B, 57(9), 976-982.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F309-6

Abstract

Bis(N-lithio-trimethylsilylamino)bis(dimethylamino)silane (1)
is formed in the reaction of silicon tetrachloride with excess
hexamethyldisilazane, followed by halogen substitution using
two equivalents of LiN(CH3)(2), and treatment with two
equivalents of n-butyllithium in hexane. 1, found to be dimeric
in the solid state, was characterised by single crystal X-ray
diffraction (monoclinic, C2/c, a = 1925.2(4), b = 1501.7(2), c
= 1389.7(3) pm, beta = 101.98(2), Z = 4, C20H60Li4N8Si6), and
by solid state and solution NMR spectroscopy and mass
spectrometry. Further reaction with titanium tetrachloride
(molar ratio 1:1) yields orange crystals of the dimer
[TiCl{(mu(2)-NSi(CH3)(3))(2)Si(N(CH3)(2))(2)}mu(2)-Cl](2) (2)
characterised by single crystal X-ray diffraction (triclinic, P
(1) over bar, a = 942.1(4), b = 991.7(4), c = 1222.6(5) pm,
alpha = 90.12(1), beta = 94.42(2), gamma = 107.64(1)degrees, Z
= 1, C20H60Cl4N8Si6Ti2).