Abstract: Configurational and conformational analysis of isomeric 2-p-nitrophenoxy-2-oxo- 1.3, 2-dioxaphosphorinane (1) and isomeric 2-p-nitrophenoxy-2-oxo-l, 3, 2- oxazaphosphorinane (2) is presented. Based upon'H NMR coupling data and 31P NMR spectra the axial and equatorial p-nitrophenoxy isomers of 1 are both in chair conformations as is the axial isomer of 2. However, NMR data support the assignment of a twist-boat ...
