Add time:09/03/2019         Source:sciencedirect.com

The reaction of pentaborane(9) with NaCN occurs in a 1:1 molar ratio at temperatures between − 30° and + 10°C to yield the complex Na[B5H9CN], which can be isolated in the form of a dioxanate. When excess pentaborane(9) is used the reaction is relatively clean and yields predominantly the [B9H14]− ion. With NaBH 3CN no intermediates of the type Na[B5H9CN] are detected, and the major product is the [B9H14]− ion, but no hydrogen is evolved in the reaction. Structures for the intermediate anions are suggested. No monocarbon carbaboranes were detected in any of the reactions.

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