Synthesis, structures, and conformational analysis of dibenzodioxadisilocins

Novel dibenzodioxadisilocins were prepared using a dehalogenative coupling reaction between (2,6-dichlorophenoxy)t-butyldimethylsilane and dimethyldichlorosilane with magnesium via an intramolecular 1,3-anionic rearrangement of the silyl group. Their structures were unequivocally confirmed by X-ray crystallography. For a comparison with the X-ray data, molecular orbital calculations on the conformations of the organosilicon macrocyclics were also carried out.