The reaction of PCl3 with 3 equivalents of 2-methoxyaniline in THF/NEt3, followed by metallation with BunLi (2 equivalents) yields a complex [Li2P(H)(NR)3]2 1 (R = 2-methoxyphenyl), whose tris imido phosphonate anion is the imido analogue of the phosphite anion, [HPO3]2−.
Synthesis and structure of a tris imido phosphonate anion; the missing link in imido analogues of phosphorus oxoanions
L. T. Burke, E. Hevia-Freire, R. Holland, J. C. Jeffery, A. P. Leedham, C. A. Russell, A. Steiner and A. Zagorski, Chem. Commun., 2000, 1769 DOI: 10.1039/B004192K
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