In the stereononrigid, low-spin, 18 electron, trigonal-bipyramidal complexes [NiX(PMe3)4]X (X = halide) axial–equatorial PMe3 interchange has been shown by 31P n.m.r. spectroscopy to follow an Ia mechanism with a 20 electron transition state involving attack by the X– ion.
P. Meier, A. E. Merbach, M. Dartiguenave and Y. Dartiguenave, J. Chem. Soc., Chem. Commun., 1979, 49 DOI: 10.1039/C39790000049
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