1,2-Dimethyl-1,2-Disila-Closo-Dodecaborane(12), the First Silicon Analog of anOrtho-Carborane

摘要

The icosahedral carboranes, especially those in which the two cluster carbonatoms are vicinal (o-carboranes), have received much attention since the first reports of their existence in 1963. Notably absent in the many publications on this class of boron cluster compounds over the intervening 25 odd years have been examples of icosahedral clusters in which the two monosubstituted carbon atoms of an o-carborane have been replaced by two monosubstituted silicon, germanium, tin or lead atoms. We report here the synthesis and structural characterization of 1, the first such Group IVA analog of an o-carborane: 1,2-dimethyl-1,2-disila-closo-dodecaborane(12) (or 1,2-dimethyl-o-silaborane). This compound is notable also in that it is the first example of a formal derivative of a disilyne, CH3Si triple bonds SiCH3 in the present case, a class of unsaturated organosilicon compounds of which there are to date no known examples. Keywords: Carboranes, Silaboranes, Organosilicon compounds, Organic chemistry, Silicon, Boron.