[CH3:1][O:2][C:3]([NH:5][NH2:6])=[O:4].[C:7]1([CH:13]=[C:14]2[CH2:20][CH2:19][CH2:18][CH2:17][CH2:16][C:15]2=O)[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1>C(O)C>[CH3:1][O:2][C:3]([NH:5][N:6]=[C:15]1[CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][C:14]1=[CH:13][C:7]1[CH:8]=[CH:9][CH:10]=[CH:11][CH:12]=1)=[O:4]9.0 g (0.1 mole) of N-methoxycarbonyl hydrazine are dissolved in 250 ml of anhydrous ethanol, under stirring, and 20.0 g (0.1 mole) of 2-phenylmethylenecycloheptan-1-one are added to the solution. The reaction mixture is kept at the boiling point under stirring, thereafter clarified with activated carbon, filtered and the filtrate is crystallized. 24.78 g of the named compound are obtained. Yield: 91%.
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