Two sets of reaction conditions have been found where a dehydrohalogenation reaction occurred when triethylamine-boron trichloride adduct was allowed to react with hexamethyldisilazane. In one case both dehydrohalogenation and cleavage occurred, resulting in the formation of a novel unsymmetrical N-silyl-substituted aminohalogenoborane. Under the other set of conditions an N-silyl-substituted aminodihalogenoborane was produced as a result of only dehydrohalogenation.

Reaction of hexaborane(l9) with liquid deuteriodiborane(6) a t -30" yielded 1,1,4,4-tetradeuteriohexaborane(l2). Further reaction with liquid deuteriodiborane(6) at room temperature resulted in the complete deuteration of hexaborane( 12). The proton magnetic resonance spectrum a t 100 MHz contains evidence for two sets of nonequivalent protons in the two BHn groups present in the compound in contrast to only one set found in the 60-MHz spectrum. There is no evidence for boron exchange between hexaborane(l2) and liquid 'OB-dihorane(6) a t -30".Hexaborane(l2) was found to be moderately stable in the liquid phase a t room temperature and in the gas phase a t higher temperatures but decomposes rapidly in the liquid phase a t 100'. Trimethylamine and propionitrile gave diborane and pentaborane(9) derivatives when they reacted with hexaborane.

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