[C:1]([C:3]1[C:8]2[CH2:9][C:10](=O)[C:11]3[CH:17]=[CH:16][CH:15]=[CH:14][C:12]=3[S:13][C:7]=2[CH:6]=[CH:5][CH:4]=1)#[N:2].O.[NH2:20][NH2:21]>C(O)C>[C:1]([C:3]1[C:8]2[CH2:9][C:10](=[N:20][NH2:21])[C:11]3[CH:17]=[CH:16][CH:15]=[CH:14][C:12]=3[S:13][C:7]=2[CH:6]=[CH:5][CH:4]=1)#[N:2]g g. of 9-cyano-10,11-dihydro-11-oxo-dibenzo[b,f]thiepin and 1 g of 100 % hydrazine hydrate were dissolved in 10 ml of ethanol and the resulting mixture was heated under reflux for 3.5 hours. The reaction mixture was concentrated to 5 ml to separate crystals on cooling, which were collected by filtration. Recrystallization from ethanol afforded 0.6 g of 9-cyano-10,11-dihydro-11-oxo-dibenzo[b,f]thiepin hydrazone as pale brown prismatic crystals having a melting point of 175°-177° C.
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