When cu-methyl-~-4-arsonophenoxyethanol was nitrated at 0'for approximately twenty minutes with one molecular portion of nitric acid (sp. gr. 1.49-1.50) the corresponding nitrate was obtained. If the reaction was carried out with two molecular proportions of nitric acid at the same temperature and for three hours the nitro ester resulted. a-Methyl-L?-2-nitro-4- arsonophenoxyethyl nitrate was hydrolyzed by refluxing with 3 N hydrochloric acid or 3 N ...