Ring compounds, phosphorus-nitrogen

Phosphorus ring compounds have generally been less extensively studied than their nitrogen or purely carbocyclic analogues, and this limits the comparisons of physical and chemical properties which might otherwise be made. 

Fig. 9. Possible conformations of fused-ring compounds (e.g. (58)). Nitrogen atoms and ring substituents are omitted. The first two letters for each structure refer to the ring conformations (b = boat, c = chair) and the second two letters refer to the phosphorus-exo-substituent (a = axial, b = bowsprit, e = equatorial, f = flagpole)...

Kas, J., Rauch, P. Labeled Proteins, Their Preparation and Application, 112, 163-230 (1983). Keat, R. Phosphorus(III)-Nitrogen Ring Compounds. 102, 89-116 (1982). 

Phosphorus magnetic shielding tensors, general phosphido ligands in transition metal complexes, 1, 472 Phosphorus(III) mercury compounds, preparation, 2, 425-426 Phosphorus—metal complexes, characteristics, 2, 34 Phosphorus—nitrogen-containing rings, chromium carbonyl link, 5, 225... 

---