Question

What happens when diborane is treated with trimethylamene?

Answer 1

Diborane adds to trimethylamine-alane in toluene or diethyl ether to produce (CH3)3N · Al(BH4)3. The action of excess diborane in toluene establishes an equilibrium competition between aluminum borohydride and diborane for trimethylarnine. Reaction of trimethylamine-borane with aluminum borohydride in toluene produces the same equilibrium mixture. In diethyl ether diborane and (CH3)3N · Al(BH4)3 form trimethylamine-borane and (C2H5)2O · Al(BH4)3. Diborane adds to solutions of dimethylaminoalane in diethyl ether or toluene to form (CH3)2NAl(BH4)2. Excess diborane slowly causes formation of μ-dimethylaminodiborane and aluminum borohydride. In tetrahydrofuran dimethylaminoalane and borane form (CH3)2NAl(BH4)2 which reacts with excess borane to produce μ-dimethylaminodiborane and n-C4H9OAl(BH4)2.

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