The geometrical imprint domain: a 1D and 2D spectra editing tool in refocused–decoupled INEPT experiments for structural analysis of silylated and acetylated glycosides

31P NMR INEPT spectroscopy: a powerful tool for structural analysis of phosphitylated carbohydrates

“…11 Aliquots of the reaction mixtures were directly placed in 5 mm sample tubes and INEPT decoupled experiments 1 were performed on a Bruker DPX-200 NMR spectrometer (operating at 81.026 MHz, external reference 85% H 3 PO 4 The following parameters were used: D 1 D 1 s; 1 H 90°p ulse, 9.0 µs; 1 H 180°pulse, 18.0 µs; 31 P 90°pulse, 5.6 µs; 31 P 180°pulse, 11.2 µs; acquisition, SW D 321.50 Hz, SI D 4K.…”

“…Spectra are recorded immediately after the polarization tranfer pulses without use of the  refocusing time. Owing to resonance overlaps, the sequence appears of limited applicability because of the complexity of the proton coupled multiplet patterns which have to be analysed by * In a previous study, 4 we applied the refocused-decoupled INEPT sequence to the structural analysis of silylated and acetylated carbohydrate model compounds. By taking advantage of computed graphical representations of the refocused INEPT analytical relation (1), we demonstrated that individual resonances can be assigned unambiguously to their specific positions on the pyranose ring.…”