The reaction of hexaethylphosphorous triamide (HETP) with the free primary hydroxyl group of 1, 2, 3, 4-di-O-isopropylidenegalactopyranose or the sterically hindered secondary hydroxyl group of 1, 2, 5, 6-di-O-isopropylideneglucofuranose gives only the corresponding phosphites [8]. However only diethylacetamide could be derived from acetic anhydride [3].
