Boron, quartet system

The only fluoropentaborane known is the 2-substituted derivative which was obtained by the reaction of 2-IB5H8 with antimony trifluoride in a flow system at low pressure 184). The compound is a liquid which is moderately stable at room temperature. No boron-fluorine spin coupling is evident in the boron-11 nmr spectrum, but a poorly resolved quartet (Jpb = 60 hz) is observed in the fluorine-19 nmr spectrum. The analogous reaction of I-IB5H8 with antimony trichloride gave a product which was too unstable to characterize 184>. 

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