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The reaction of appropriate amounts of BH3 with diazadiboretidines (RBNtBu)2 (1a–e; R = Et, Pr, Bu, tBu, tBu(Me3Si)N) transforms them into cyclic diazapentaboranes either of the type [RB(H2)BRNtBuBHNtBu] (2a–c), of the type [HB(H2)BRNtBuBHNtBu] (3a–d), or of the type [HB(H2)BHNtBuBHNtBu] (4), or into an acyclic product RBHNtBuBHNtBuBHR (2e). The structure of 3c is characterized by a planar N2B3 ring skeleton with an unsymmetrical double‐hydrogen bridge.
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Küpper et al. (1990) studied this question.
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