Crystal and molecular structure of 3,7-dihydro-1,1,3,3,5,5,7,7-octamethyl-1H,5H-benzo[1,2-c:4,5-c′]bis[1,2,5]oxadisilole

Abstract

Crystals of the title compound are monoclinic, space group P2₁/c with a= 10·669(9), b= 9·159(8), c= 11·518(10)Å, β= 115·2(1)°. Diffractometer data for 1401 planes were refined by least squares to R 0·045. The nature of the molecule was unknown and the structure was determined by direct methods. Bond lengths in the oxadisilole ring, which has approximate C_2v, symmetry, are: C–C 1·411, Si–C 1·882, and Si–O 1·647 Å.