It is shown by 31P, 13C, and 1H n.m.r. spectroscopy that BunLi and the phosphonates (1) and (2) in tetrahydrofuran give a single, planar, charge-delocalized species (A), whereas ButOK and ButOLi and (1) give another species (B) in addition to (A); the structure proposed for (B) is analogous to that of the lithium adducts of phosphorus ylides.
T. Bottin-Strzalko, J. Seyden-Penne and M. Simonnin, J. Chem. Soc., Chem. Commun., 1976, 905 DOI: 10.1039/C39760000905
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