Anti-2,2,3,3,6,6,7,7,10,10,11,11,14,14,15,15-Hexadecamethyl-2,3,6,7,10,11,14,15-octasilapentacyclo[10.4.2.24,9.05,8.013,16]icosa-1(17),4,8,12(18),13(16),19-hexaene

Abstract

The title compound, C28H52Si8, was synthesized by condensation of two mol­ecules of 1,2,3,4-tetra­kis­(chloro­dimethyl­sil­yl)benzene with lithium. The 3,4-disila-1,2-benzocyclo­butene rings in the centrosymmetric molecule are bridged by 1,1,2,2-tetra­methyl­disilanylene chains with an anti conformation. The benzene rings are deformed by fusion with a 3,4-disilacyclo­butene ring resulting in a slight boat conformation. Two Si—C bonds are bent to reduce the steric repulsion between the methyl groups on the two Si atoms and the methyl groups on another two Si atoms.