Da. Efremov et al., THE PHOSPHORYLATION OF ORGANIC-COMPOUNDS BY PHOSPHORIC ANHYDRIDE .2. PHOSPHORYLATED AZOLES, Phosphorus, sulfur and silicon and the related elements, 92(1-4), 1994, pp. 167-170
Benzimidazoles and benzotriazoles are phosphorylated by phosphoric anh
ydride to give pyroamidophosphates (2) and their corresponding phospho
roamidic acids (3). N.m.r. data of the phosphorylated, 5,6-dimethylben
zotriazoles supported the existence of facile phosphorotropy.