Abstract
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.
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