[CH:1]1[CH2:6][CH2:5][CH2:4][CH2:3][CH:2]=1.[N+]([O-])([O-])=O.[Hg+2:11].[N+]([O-])([O-])=O.[Cl-:16].[Na+].[OH2:18].[C:19](#[N:21])[CH3:20]>>[C:19]([NH:21][C@@H:1]1[CH2:6][CH2:5][CH2:4][CH2:3][C@H:2]1[Hg:11][Cl:16])(=[O:18])[CH3:20]20 ml (0.2 mole) of cyclohexene in 50 ml of acetonitrile are added dropwise over the course of 20 minutes to a suspension of 65 g (0.2 mole) of mercury(II) nitrate in 150 ml of acetonitrile at 0° C. After 1 hour at room temperature, the yellow solution is poured into a mixture of 100 ml of saturated sodium chloride solution and 500 ml of water; the precipitated product is filtered off with suction, washed with water and dried in vacuo. 75 g of colorless crystals of melting point 200°-201° C. are obtained.
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