Charge location and fragmentation under electron impact. IV—the behaviour under electron impact of some N‐methyl, N′‐R‐1,2,4‐phosphadiazetidine‐3‐ones and related compounds

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Abstract
The ionization potentials of a series of N‐methyl,N′‐R‐1,2,4‐phosphadiazetidine‐3‐ones and related compounds have been determined. The nature of the highest occupied orbital of the molecules and the use of empirical rules to rationalize the variations in the ionization potentials are discussed. The changes in the fragmentation patterns are related to the different low ionization potential site(s) in each molecule. The occurrence of various rearrangement ions are discussed on a similar basis.