Br[C:2]1[CH:3]=[CH:4][C:5]2[CH2:11][CH2:10][C:9]3[CH:12]=[CH:13][CH:14]=[CH:15][C:8]=3[C:7](=[O:16])[C:6]=2[CH:17]=1.[Cu](C#N)[C:19]#[N:20].CN(C)C=O.Cl>[Fe](Cl)(Cl)Cl.O>[C:19]([C:2]1[CH:3]=[CH:4][C:5]2[CH2:11][CH2:10][C:9]3[CH:12]=[CH:13][CH:14]=[CH:15][C:8]=3[C:7](=[O:16])[C:6]=2[CH:17]=1)#[N:20]7.2 g. of 3-bromo-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one, together with 2.7 g. of copper cyanide and 10 ml. of dimethylformamide, are heated to boiling under reflux conditions for 6 hours. The resulting hot solution is poured into a solution containing 10 g. of iron trichloride in 15 ml. of water and 3 ml. of concentrated hydrochloric acid, stirred at 70° C. for 20 minutes and extracted with toluene. The toluene extract is washed first with 3N hydrochloric acid and then with 3N caustic soda, dried over sodium sulfate and evaporated. The 3-cyano-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one which is obtained, is purified by adsorption on the 10-fold amount of Kieselgel (eluting agent: toluene); melting point 104°-106° C.
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