B. Wrackmeyer et al., NOVEL BICYCLIC ORGANOBORANES VIA 1,1-ORGANOBORATION, Journal of the Chemical Society, Chemical Communications, (3), 1995, pp. 399-401
Tris[ethynyl(dimethyl)silyl]methane 1 and ris[trimethylstannylethynyl(
dimethyl)silyl]methane 2 react with triethylborane 3 via a threefold 1
,1-ethylboration to give the new bicylic compounds 4 and 5 in good yie
lds; the molecular structure of 5 was determined by a single crystal X
-ray analysis.