Nitrogen, electron structure metal catalyzed reaction with

Further reaction occurs with another BH molecule, and proceeds through the formation of hydrogen bonds between BH and either —O or —N— of one of the two resonance forms (it is not known which one). In a catalyzed reaction the catalyst can also take the place of the first BH molecule. Sterically unhindered amines such as triethylene diamine can thus catalyze the addition through the effect of the electron lone pairs on the nitrogen atom, which, because of the triethylene diamine structure, are particularly accessible. Metal salts such as di-n-butyl zinc diacetate are also very active. 

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