Cl.[Cl:2][C:3]1[C:12]([Cl:13])=[C:11]2[C:6]([CH2:7][CH2:8][NH:9][CH2:10]2)=[CH:5][CH:4]=1.[C:14]([O-])(=[O:16])[CH3:15].[Na+].C(OC(=O)C)(=O)C.N>O.C(O)(=O)C>[C:14]([N:9]1[CH2:8][CH2:7][C:6]2[C:11](=[C:12]([Cl:13])[C:3]([Cl:2])=[CH:4][CH:5]=2)[CH2:10]1)(=[O:16])[CH3:15]7,8-Dichloro-1,2,3,4-tetrahydroisoquinoline hydrochloride (0.001 mole) was treated with sodium acetate (0.001 mole), acetic anhydride (0.00125 mole), and 2 ml. of acetic acid and the mixture was heated at 95° C. for 15 minutes. The mixture was cooled, diluted with water, made alkaline with aqueous ammonia and extracted with chloroform. Concentration of the extract and recrystallization of the residue from isopropanol gave 2-acetyl-7,8-dichloro-1,2,3,4-tetrahydroisoquinoline, m.p. 99.5-100° C.
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