Hydrazine hydrate (1:1) → N,N-bis(1-Methylethyl)-1,2-ethanediamine, dihydrochloride

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A solution of 40.54 g (0.148 mole) of 2-[2-[[N,N-bis(1-methylethyl)amino]ethyl]-2H-isoindole-1,3-dione and hydrazine hydrate (85%, 11.8 g, 0.2 mole) in 400 ml of 95% ethanol was heated at reflux for 5 hours. The reaction mixture was allowed to cool to room temperature while standing overnight. A white solid formed. The reaction mixture was concentrated almost to dryness on the rotary evaporator. The residue was dissolved in chloroform and extracted with 10% sodium hydroxide. After removing chloroform, a brown oil was obtained. A portion of the oil was dissolved in methanol and converted to the dihydrochloride salt. After recrystallization from methanol-diethyl ether, 1.50 g (20%) of white crystalline product, m.p. 178°-182° C. (decomposition) was obtained.

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