[C:1]1([CH:7]=[C:8]2[CH2:13][CH2:12][CH2:11][CH2:10][C:9]2=O)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH3:15][O:16][C:17]([NH:19][NH2:20])=[O:18]>C(O)C>[CH3:15][O:16][C:17]([NH:19][N:20]=[C:9]1[CH2:10][CH2:11][CH2:12][CH2:13][C:8]1=[CH:7][C:1]1[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1)=[O:18]To a solution of 37.2 g (0.2 moles) of 2-phenylmethylenecyclohexan-1-one in 200 ml of anhydrous ethanol a solution of 18.0 g (0.2 moles) of N-methoxycarbonyl hydrazine in 40 ml of anhydrous ethanol is added, under stirring. The reaction mixture is boiled for a short while, then cooled, clarified with activated carbon, filtered and the filtrate is cooled. The separated white crystals are filtered off and dried. 50.63 g of the desired compound are obtained. Yield: 98%.
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