“…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).…”