An X-ray structural determination of the dimer [Li(Ph4P2N4Ph)·THF]2(THF = tetrahydrofuran) reveals a step-shaped structure; 7Li and 31P NMR investigations of [Li(Ph4P2N4S2R)·THF]2(R = Me, But, Ph), as a function of temperature and concentration, in THF solution show that this dimer is fluxional and indicate the presence of a second dimeric species.
T. Chivers, M. Edwards, R. W. Hilts, M. Parvez and R. Vollmerhaus, J. Chem. Soc., Chem. Commun., 1993, 1483 DOI: 10.1039/C39930001483
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