Selective Si–Si Bond Cleavage of Decaisopropylbicyclo[2.2.0]hexasilane with Hydrobromic Acid and Hydrochloric Acid

In the reactions of decaisopropylbicyclo[2.2.0]hexasilane (1) with hydrobromic acid and hydrochloric acid, the bridgehead Si–Si bond of 1was selectively cleaved to give 1-halo-1,2,2,3,3,4,5,5,6,6-decaisopropylcyclohexasilanes. The X-ray crystallographic analysis of the products indicates that the cis-addition of the acids to the Si–Si bond is preferable.