Abstract
Cyclo-tetraphosphazen was made from phosphorus pentoxide and ammonium chloride. Cyclo-tetra-μ -imido-tetraphosphate was prepared by hydrolyzing cyclo-tetraphosphazene. The hydrolytic reaction of cyclo-tetra-μ-imido-tetraphosphate was carried out in aqueous solutions of acetic acid, citric acid, hydrochloric acid, and polyacrylic acid.