Hydrochloric Acid → Hydrazine,1,2-bis(2-chlorophenyl)-

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84 Parts of an aqueous solution of technical sodium hydrosulfide, free from sodium thiosulphate, were added to a mixture comprising 53.4 parts of 2,2'-dichloroazoxybenzene in 140 parts of morpholine at 60° C - 65° C within 90 minutes. Subsequently, the reaction temperature was raised to 75° C and maintained at that temperature for 2 1/2 hours. Next the temperature was further raised to 90° C and maintained at that temperature for 1 hour. The pH of the reaction mixture varied between 9.5 to 10. After this period the absence of the starting material was confirmed. Then the reaction mixture was cooled to 20° C and neutralized cautiously with 400 parts of hydrochloric acid of 15 percent strength at a temperature below 20° C. Then the reaction mixture was cooled to 0° C to 5° C, and the resulting precipiatate filtered off and washed with water until free of chloride. After drying below 70° C, 40.1 parts of 2,2'-dichlorohydrazobenzene of a melting point of 85° C to 87° C were obtained, this representing a yield of 79 percent of the theory.

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