Organophosphorus Compounds. I. Derivatives of 3-Nitro-4-chlorophenylphosphonic Acid

The Phosphonous Acids and Their Derivatives.

“…The use of more dilute hydrogen peroxide for the synthesis of phosphonous acids from organophosphines was noted in Section II,A,6. Nitric acid has been found useful with aliphatic phosphonous acids because of the high stability of the products toward oxidation (44,104,233), but aromatic phosphonous acids may suffer nitration of the ring in the process (28,251). Electrolytic oxidation has been attempted unsuccessfully (210).…”

The Preparation And Properties Of Phosphonic Acids

“…Diethyl «-methyl-5-styrylphosphonate is cleaved to «-methylstyrene and phosphoric acid when heated with hydrochloric acid (8). It was originally claimed that when dialkyl trichloromethylphosphonates were hydrolyzed with 15 per cent hydrochloric acid the carbon-phosphorus bond was cleaved to give the alkyl chloride, carbon dioxide, and phosphorous acid (114). More recent work on this subject, however, has disproved this claim, and it has now been shown that trichloromethylphosphonic acid can be readily obtained by the hydrolysis of its esters by hydrochloric acid (29,63,248,250,252).…”