Abstract

The title compound, C22H22Si, is a benzosilacyclo­pentene in which the silacyclo­pentene ring assumes an envelope conformation. The Si atom is displaced by 0.722 (4) Å from the mean plane of the four C atoms, and is bonded to two methyl groups and to two Csp3 atoms in the silacyclo­pentene ring. One phenyl ring is attached to each of these two C atoms in a cis configuration. The Si atom and the two methyl groups lie on a crystallographic mirror plane which relates the two halves of the molecule. The average Si—Cmeth­yl bond distance is 1.852 (3) Å. The Si—Csp3 bond distance is 1.886 (2) Å, and the corresponding Csp3—Si—Csp3 angle is 93.0 (1)°. The displacement ellipsoids for the atoms in the fused benzene ring suggest a probable disorder, but no satisfactory disorder model could be found.

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