CYCLIC ORGANIC DERIVATIVES OF HYPOPHOSPHOROUS ACID

Article abstract of DOI:10.1016/S0040-4020(01)98852-0

2-H-1,3,2-Dioxa-, dithia-, diaza- and oxaazaphosphorinanes have been prepared by reducing corresponding phosphorichloridates; spectral and chemical properties of these compounds have been studied.These compounds were considered as initial members of series when investigating the stereochemistry of heterocycles substituted at the phosphorus.The examination of 1H, 13C and 31P NMR spectra has shown that substitution of hydrogen at the phosphorus by axial halogen, alkyl, alkoxy and amido-groups is accompanied by shielding of 4,6-C atoms and deshielding of 4,6-axial protons; introduction of an axial Me group into γ-position to the P-H fragment causes a 30-40 ppm up-field shift of the resonance of the phosporus nucleus.