The syntheses of 2-hydroxybenzothiazole substituted cyclotriphosphazenes: Spectroscopic characterizations

The nucleophilic substitution reactions of mono- and bis-spiro-2,2'-dioxybiphenyl cyclotriphosphazenes (1a and 1b) with 2-hydroxybenzothiazole (2) were performed in the presence of metallic sodium in THF. Two novel 2-oxybenzothiazole-substituted spiro-2,2′-dioxybiphenyl cyclotriphosphazene derivatives (3a and 3b) were obtained from these reactions. Both compounds (3a, 3b) have been characterized by elemental analysis as well as by 1H, 13C and 31P NMR spectroscopy. Compounds 3a and 3b are reported for the first time in this study.