[N+:1]([C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[CH2:9][NH:8][CH2:7]2)([O-:3])=[O:2].C(=O)([O-])[O-].[K+].[K+].[Cl:19][CH2:20][C:21](Cl)=[O:22]>C(OCC)(=O)C>[Cl:19][CH2:20][C:21]([CH:9]1[C:10]2[C:6](=[CH:5][C:4]([N+:1]([O-:3])=[O:2])=[CH:12][CH:11]=2)[CH2:7][NH:8]1)=[O:22]To a suspension in which 42.8 g of 5-nitroisoindoline had been added to an aqueous potassium carbonate solution (108 g of potassium carbonate, 200 ml of water) was added dropwise 200 ml of an ethyl acetate solution containing 31.2 ml of chloroacetyl chloride at 0° C. over 1 hour. The mixture was further stirred at 0° C. for 45 minutes and precipitates were collected by filtration. The obtained solid-was treated with activated carbon in ethyl acetate and recrystallized to obtain 2-chloroacetyl-5-nitroisoindoline.
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