Phosphoranes containing a P-H Bond

Reaction of (19) with methylsilane gave the phosphorane (20), which dispro-portionated above room temperature to (21) and (22). Low-temperature F and P n.m.r. spectra suggest a ground-state geometry for (20) containing two apical CFs groups in a tbp framework, and line-shape analysis of the P 

Reaction of (23) with (24) gave the novel series of bicyclic phosphoranes (25) in 67—69% yield, and a similar displacement of a dialkylamino group from three-co-ordinate phosphorus (26) by the amidoxime (27) gave the phosphorane 

The first example of a stable H3B-N-P-N-BH3 sequence has been provided by the reaction of (31) with diborane to give (32), in which the BH3 groups appear to be co-ordinated with the apical nitrogen atoms. Preliminary investigations 

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