Elctron-impact studies of diazadiphosphetidines

Electron-impact studies of diazadiphosphetidines,[YF₂PNMe]₂(Y? F,Me, Ph, MeO,2,5-Me₂C₆H₃, and m-CF₃C₆H₄) are reported, the most abundant fragments corresponding to m/e [M/2–1]⁺, [M/2]⁺ and [M/2–1]⁺. It is concluded from metastable data that formation of the noval rearrangement ion, [M]⁺→[M/2+1]⁺is predominantly due to an electron-impact process. Variable temperature spectra of(F₃PNMe)2, (i.e. for Y=F), suggest that ions of m/e [M/2-1]⁺are formed, in part, by a thermal process. For the compound [(m-CF₃C₆H₄)F₂PNMe]₂ a well resolved negative ion spectrum has been obtained, with the molecular ion present in 100% abundance.