Hydrochloric Acid → 2-(4-Isopropoxy-2-fluorophenyl)hydrazonomalonyldiurethane

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A mixture of 5.92 g (0.035 mole) of 4-isopropoxy-2-fluoroaniline, 10.60 g (0.043 mole) of malonyldiurethane, and 41.02 g (0.500 mole) of sodium acetate was suspended in 1000 mL of water with vigorous stirring. To this suspension was added 25 mL of 12N hydrochloric acid. The reaction mixture was cooled to 10° C., and, while this temperature was maintained, a solution of 2.42 g (0.035 mole) of sodium nitrite in 25 mL of water was slowly added. The reaction mixture was allowed to warm slowly to room temperature where it was stirred under a nitrogen atmosphere for approximately 16 hours. During this period a yellow solid formed and precipitated out. The mixture was filtered, and the yellow solid was washed in succession with water and diethyl ether. After being dried, 9.20 g of 2-(4-isopropoxy-2-fluorophenyl)hydrazonomalonyldiurethane was isolated as a yellow solid. The NMR and IR spectra were consistent with the proposed structure.

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