CRYSTAL STRUCTURE OF 2-[3,4,5,6-TETRAKIS(TRIMETHYLSILYL)-1-CYCLOHEXEN-1-YL]HEPTAMETHYLTRISILANE

The crystal structure of 2-[3,4,5,6-tetrakis(trimethylsilyl)-1-cyclohexen-1-yl]-heptamethyltrisilane has been determined from three-dimensional single-crystal X-ray diffraction data collected by counter methods. The crystals are orthorhombic, space group Pna21 with unit cell parameters a = 24.081 ± 0.008, b = 9.839 ± 0.007, c = 15.973 ± 0.009 Å, ρo = 0.967, ρc = 0.984 g/cm3 for Z = 4. Block-diagonal anisotropic least-squares refinement led to a conventional R of 0.07 for 1225 observed reflections. The molecular structure is composed of a tetrasubstituted cyclohexene ring with the carbon-carbon double bond vinylic to the trisilane moiety. The average Si-Si bond distance is 2.35 ± 0.01 Å, and the average Si-C(sp3) bond distance is 1.88 ± 0.04 Å. © 1969.