23. "Palladium(II) Terminal Phosphido Complexes Derived from Cyclometalated Dimesitylphosphine: Synthesis, Structure, and Low-Barrier Phosphorus Inversion," Michael A. Zhuravel, David S. Glueck, Lev N. Zakharov, and Arnold L. Rheingold, Organometallics 2002, 21, 3208-3214.

Abstract. The cyclometalated cationic Pd(II) and Pt(II) complexes [M(diphos)(CH₂C₆H₂Me₂P(Mes)(H))][X] (5-8, M = Pd, Pt; diphos = dppe = Ph₂PCH₂CH₂PPh₂, dppen = cis-Ph₂PCH=CHPPh₂; Mes = 2,4,6-Me₃C₆H ₂; X = OTf, BF4) 5-8 were prepared by thermolysis of the cations [M(diphos)(Me)(PMes₂H)][X]. Deprotonation of 5-8 gave the neutral phosphido complexes M(diphos)(CH₂C₆H₂Me₂P(Mes)) 9-12; the Pd(II) compounds 9 and 11 are the first examples of stable palladium terminal phosphido alkyl complexes, and their crystal structures were determined. Fluxional processes in complexes 9-12 were studied by variable-temperature NMR spectroscopy; the spectra are consistent with low barriers to phosphorus inversion.