Crystal structure of 4,8-di-tert-butyl-6,6-di­chloro-13-ethyl-2,10-dimethyl-13,14-di­hydro-12H-dibenzo[d,i][1,3,7,2]dioxaza­silecine toluene 0.25-solvate

The coordination polyhedron at the silicon atom in the title compound, C(26)H(37)Cl(2)NO(2)Si·0.25C(7)H(8), is typical for penta­coordinated 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 mol­ecules 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 mol­ecules resulted in r.m.s. deviation of 0.017 Å. The conformations of the two mol­ecules are almost the same, with corresponding torsion angles differing by less than 5.5°. The toluene solvent mol­ecule is disordered about an inversion centre.