(Iminomethylidene)phosphines (RP=C=NR)

Curt Wentrup, Horst Briehl, Gerd Becker, Gudrun Uhl, Hans-Jürgen Wessely, André Maquestiau & Robert Flammang
There has been much recent interest in compounds incorporating P=C 2,3 and P=P 4 double bonds. Furthermore, the stable (2,2-dimethylpropylidyne)phosphine, (CH 3)CC≡P, featuring a PC triple bond has been prepared.5 However, previous attempts to isolate cumulenes possessing a two-coordinate phosphorus atom, RP=C=X, have failed,2,3,6 except in a single case, the preparation of the stable and sterically protected (CH 3)CP=C=NC(CH 3h)-3. We now wish to report a general method of preparation of unstable (iminomethylidene)phosphines (monophosphorus analogues...
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