The application of the refocused‐decoupled INEPT pulse sequence in 31P NMR spectroscopy allows, in conjunction with computer simulations, a straightforward editing of the spectra. Experiments were performed on phosphite derivatives of selected mono‐ and disaccharide model compounds. Structural investigations point towards the existence of homonuclear 31P– 31P couplings through O— P coordination versus coupling through the ring chains, the origin of which is being attributed to donor– acceptor chelating interactions between phosphorus and oxygen atoms in spatially closely related dioxaphospholane rings. Copyright © 2000 John Wiley & Sons, Ltd.

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This paper reports application of the one-dimensional 13C NMR “extended” distortionless enhancement by polarization transfer (DEPT) editing method to the determination of hexopyranose ring 13C nuclei. Relative spatial arrangements of the vicinal protons in the local environment of a skeletal carbon atom are determined from the signs of intensity modulation profiles and connected with their specific positions in the ring. In combination with a computer simulation program, the “extended” DEPT sequence allows the straightforward and unambiguous assignment of the hexopyranose ring carbon atoms.