Mass Spectrometric Study of the B2D6–B5H9 Exchange Reaction

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Abstract
The distribution of partially deuterated pentaborane species resulting from the reaction between B2D6–B5H9 and its converse B2H6–B5D9 has been examined mass spectroscopically. It was found that the deuterium is entering the pentaborane by two main processes; namely exchange and synthesis by pyrolysis of diborane. The number of readily exchangeable positions in the pentaborane under our experimental conditions is five. If the remaining four hydrogens are exchanging they are doing so at a very much slower rate. Examination of the mass spectrum indicates that the deuteriums are entering the molecule singly during exchange. Tracer studies with B10 indicate that borons are not involved in the exchange.

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