[Cl:1][C:2]1[CH:10]=[CH:9][C:5]2[NH:6][N:7]=[N:8][C:4]=2[CH:3]=1.Cl[CH2:12][C:13](=[O:15])[CH3:14].C(=O)([O-])[O-].[K+].[K+].[I-].[K+]>CC(C)=O>[Cl:1][C:2]1[CH:10]=[CH:9][C:5]2[N:6]([CH2:12][C:13](=[O:15])[CH3:14])[N:7]=[N:8][C:4]=2[CH:3]=1.[Cl:1][C:2]1[CH:10]=[CH:9][C:5]2[N:6]=[N:7][N:8]([CH2:12][C:13](=[O:15])[CH3:14])[C:4]=2[CH:3]=1A mixture of 5 g of 5-chlorobenzotriazole, 1.4 g of chloroacetone, 5.1 g of potassium carbonate and 0.5 g of potassium iodide is stirred into 50 ml of acetone at room temperature for 48 h. The mixture is subsequently filtered, the filtrate concentrated by evaporation in a vacuum, and the residue purified by flash chromatography. In this way, two isomeric products, 1-(5-chlorobenzotriazol-1-yl)-propan-2-one and 1-(6-chlorobenzotriazol-1-yl)-propan-2-one, are isolated in approximately the same quantities, the first of which is then used directly in the next step.
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