反应详情

By substituting 5-(3-dimethylaminopropyl)-3-methylsulfonyl-5H-dibenzo[a,d]cycloheptene for the 5-(3-dimethylaminopropylidene)-5H-dibenzo[a,d]cycloheptene of Example 6, Step A, and following substantially the same procedure described in Example 6, Steps A and B, there is obtained 5-(3-methylaminopropyl)-3-methylsulfonyl-5H-dibenzo[a,d]cycloheptene as an oily residue. The base is converted to the hydrogen oxalate salt by treating an ethanolic solution of the base with a 10% excess of oxalic acid in ethanol. Dilution with absolute ether precipitates 5-(3-methylaminopropyl)-3-methylsulfonyl-5H-dibenzo[a,d]-cycloheptene hydrogen oxalate as a white crystalline solid, m.p. 114°-119°C. dec. An analytical sample melts at 114°-115°C. dec. after two recrystallizations from mixtures of absolute ethanol and absolute ether.