Diamidophosphorous Acid, (NH₂)₂POH

Diamidophosphorous Acid, (NH₂)₂POH, was made, together with diammonium phosphite, by the action of ammonia on phosphorous oxide dissolved in ether or benzene:—

P₄O₆ + 8NH₃ = 3(NH₂)₂POH + (NH₄O)₂POH

It is a white solid, which can be melted and sublimed with some decomposition, and combines with water, evolving much heat. It was hydrolysed by hydrochloric acid giving phosphorous acid, which was decomposed into phosphine and phosphoric acid.