title: Crystal structure of 4,8-di-tert-butyl-6,6-di-chloro-13-ethyl-2,10-dimethyl-13,14-di-hydro-12H-dibenzo[d,i][1,3,7,2]dioxaza-silecine toluene 0.25-solvate.
abstract: The coordination polyhedron at the silicon atom in the title compound, C26H37Cl2NO2Si·0.25C7H8, is typical for penta-coordinated silicon derivatives and represents a slightly distorted trigonal bipyramid with an N atom and a Cl atom in the apical positions and the two O atoms and the other Cl atom occupying the equatorial sites. There are two independent mol-ecules in the asymmetric unit. The N-Si-Cl fragment in each is close to linear [178.24 (5) and 178.71 (5)°], in good agreement with 4e-3c theory, as is the elongation of the apical bond lengths [Si-Cl = 2.1663 (7) and 2.1797 (7) Å] in comparison with the equatorial bonds [Si-Cl = 2.0784 (7) and 2.0748 (7) Å]. Orthogonal least-squares fitting of the two independent mol-ecules resulted in r.m.s. deviation of 0.017 Å. The conformations of the two mol-ecules are almost the same, with corresponding torsion angles differing by less than 5.5°. The toluene solvent mol-ecule is disordered about an inversion centre.
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Department of Chemistry, M.V. Lomonosov Moscow State, University, Moscow, Russian Federation.
authors: Ekaterina A
authors: EA
authors: Kuchuk
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Department of Chemistry, M.V. Lomonosov Moscow State, University, Moscow, Russian Federation.
authors: Kirill V
authors: KV
authors: Zaitsev
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Department of Chemistry, M.V. Lomonosov Moscow State, University, Moscow, Russian Federation.
authors: Sergey S
authors: SS
authors: Karlov
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation.
authors: Mikhail P
authors: MP
authors: Egorov
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.
authors: Andrei V
authors: AV
authors: Churakov
keywords: crystal structure; heavy carbenes; penta­coordinated silicon