N.m.r. spectroscopic studies of three new tetra-alkylphosphoranes, Me(CF3)3PX (X = F, Cl, OMe), confirm their true phosphoranes character and suggest that the ground state structures observable at low temperatures have a halogen and a CF3(X = F, Cl) or two CF3 groups (X = Me) in the axial positions of a trigonal bipyramidal framework.
K. I. The and R. G. Cavell, J. Chem. Soc., Chem. Commun., 1975, 279 DOI: 10.1039/C39750000279
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