Pseudorotation in XPF4

Synthesis, structure, and reaction of tricoordinate stibine and tetracoordinate stiboranide

“…The relative preference of substituent occupying the apical site is particularly known as apicophilicity [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. From many experimental systems and theoretical calculations, an oxygen atom is determined to be much more apicophilic than a carbon atom [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. Antiapicophilic compound, which violates relative apicophilicity of the elements, generally has high energy and is unstable, thus easily isomerizes into its stable apicophilic compound.…”

A model for calculating conformational energies in pentacoordinate phosphorus compounds

“…In this way the first new derivative, CH3C=P, was made by pyrolysis of CH3CH2PC12. 14 During microwave investigations of the pyrolysis products of CF3PH2 not only was CF2=PH detected13 but also two new species, PH2F and FC=P. These two new molecules were produced in very low yields and it was during attempts to improve this situation that an original, simple, and effective room temperature synthesis of FC=P was evolved which avoids the destructive conditions which obtain in high-temperature processes.…”

Phosphoranes. 8. Dynamic carbon-13 NMR studies of a series of fluxional tetraalkylphosphoranes (CF3)3CH3PY [Y = fluorine, chlorine, methoxy, methylthio, dimethylamino]

“…Except for the position of CH3, this order agrees with our order for tetraalkylphosphoranes. The positions of F and CH3 are deduced, rather unreliably, by the fact that these two systems remain fluxional at the lowest temperatures attainable, 16,17 approximately -160 to -180 °C.…”

“…While several pathways can be envisaged involving various alternate allowed modes, we consider herein only a sequence of reasonable BPR (or equivalent TR) processes, in keeping with the conclusion that F exchange in R2NPF4 involves a BPR-type process. 17 The observable permutational requirements are also satisfied by a series of BPR processes.…”