Additions to Unsaturated Phosphine Oxides

Additions to Unsaturated Phosphine Oxides.—Two very similar papers have described the addition of amines to bis-(l-alkynyl)phosphine oxides, 

Pyrazoles (38) are formed in good yields by the dipolar addition of A -phenylsydnone to diphenyl(prop-l-ynyl)phosphine oxide at high temperatures. similar additions of diazodiphenylmethane to a series of vinylphosphine oxides result in the formation of 1-pyrazolines (39), which 

Miscellaneous Reactions.—Details have appeared of a series of rearrangements of the phosphine oxides (41a, b) in which the diphenyl-phosphinyl group migrates to a carbonium centre to the phosphorus. 

A great deal of the work published in the past year in this area of phosphorus chemistry has involved minor variations on old themes, and in this chapter only work which has some novelty is discussed in any detail. 

The use of phosphorous acid derivatives in synthesis has been reviewed.  

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