The first two dications having a [HBP3]2 ⊕ framework (1 and 2)—the boron atom is surrounded by three phosphonium centers and a hydrogen atom—were isolated as dibromides and characterized by X-ray structure analysis. The stability of the two salts toward air and moisture is remarkable. The boron-bonded H atom is exchanged for a D atom in alkaline D2O.
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Schmidbaur et al. (1988) studied this question.