W. Clegg et al., Lithiated organophosphorus enamines: a new synthetic approach and the first crystal structures, CHEM COMMUN, (15), 1999, pp. 1401-1402
Made by a nitrile insertion/hydrogen migration process via Ph2P(O)CH2Li and
(BuCN)-C-t, the enamide Ph2P(O)CH=C(Bu-t)N(H)Li and its TMEDA hemisolvate
exist as tetrameric and dinuclear arrangements respectively: the novel stru
cture of the starting lithiated phosphane oxide, also in its TMEDA hemisolv
ated form, is shown to contain Li-C contacts of two distinct types.