Elctron‐impact studies of diazadiphosphetidines

Electron‐impact studies of diazadiphosphetidines,[YF 2 PNMe] 2 (YF,Me, Ph, MeO,2,5‐Me 2 C 6 H 3 , and m‐ CF 3 C 6 H 4 ) 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(F 3 PNMe)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‐ CF 3 C 6 H 4 )F 2 PNMe] 2 a well resolved negative ion spectrum has been obtained, with the molecular ion present in 100% abundance.