Hydrazine hydrate (1:1) → 2-hydrazino-5-o-chlorophenyl-7-ethyl-3H-thieno[2,3-e][1,4]diazepine

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[d] 32.1 g of 5-o-chlorophenyl-7-ethyl-1,2-dihydro-3H-thieno[2,3-e][1,4] diazepine-2-thione obtained in the above example [a] is suspended in 200 ml of ethanol, and to the suspension is added 8 g of hydrazine hydrate. Several minutes stirring turns the suspension into a homogeneous, red, transparent solution. Then crystals begin to precipitate. After stirring at room temperature for 2 hours and subsequent ice-cooling, the crystals are collected by suction filtration and washed well with methanol to give 28.6 g of almost pure 2-hydrazino-5-o-chlorophenyl-7-ethyl-3H-thieno[2,3-e][1,4]diazepine as yellowish crystals. The crystals, when recrystallized from a mixture of ethanol and diemethylformamide, show a melting point of 214° - 216°C (decomposition).

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