Lanthanum tris(tetraphenylimidodiphosphinate){La(tpip)3} reacts with ethyl acetate to give a stable 1 : 1 adduct, the X-ray structure of which has been established; complexes of the general structure Ln(tpip)3 can be used successfully as n.m.r. shift reagents in association with acids and phenols.
I. Rodriguez, C. Alvarez, J. Gomez-Lara, R. A. Toscano, N. Platzer, C. Mulheim and H. Rudler, J. Chem. Soc., Chem. Commun., 1987, 1502 DOI: 10.1039/C39870001502
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