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In the reaction 2X + B2H6 -> [BH2(X)]2+ + [BH4]-, which amine(s) X can bring about this unsymmetrical cleavage of diborane?

1. NH3
2. CH3NH2
3. (CH3)2NH
4. (CH3)3N

Correct answer: NH3

Solution

Small amines such as NH3 cause unsymmetrical (ionic) cleavage of B2H6 giving [BH2(NH3)2]+ and [BH4]-, whereas bulky bases like (CH3)3N give symmetrical cleavage.

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