Azide diphenyl phosphate, referred to as Dppa (Diphenylphosphoryl azide), is an organic synthetic reagent. Colorless and no explosive oil-like liquid. Boiling point 134-136°c, soluble in organic solvents, insoluble in water, color change and decomposition when exposed to light and contact with moisture. The chemical properties are lively and are widely used in organic synthesis as substitutes for sodium azide.