Bonds to Group III Metals

Bonds to Group III Metals. The reaction of [Ph2Si]4 with lithium in THF causes ring fission to give (80), which could be isolated as its THF adduct. Treatment of (80) with Cl2BNMe2 resulted in the formation of the heterocycle (81).  

Boron trichloride reacts smoothly with l-SiHgBgHg to yield l-(ClH2Si)B5Hg in essentially quantitative yield. Chlorovinylsilanes and alkylchlorovinyl-silanes silylalkylate o-, m-, and / -carbaboranes in the presence of AICI3. The silylalkylation proceeds at a B—H bond of the carbaborane nucleus with the formation of silicon-containing. B-substituted carbaboranes, e.g. 

The reaction of sodium dicarbahexaborane with MCaSnBr or MegPbCl in THF forms the respective /f-trimethylmetal-dicarbahexaborane(8). From spectroscopic data, the structures (82) are proposed. Their reactions with DCl 

100 g Hengge and D. Wolfer, Angew. Chem. Internat. Edit., 1973 12, 315. 

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