[Cl:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:10]=1[NH:9][C:8](=[O:11])[C:7]2=[O:12].C(=O)([O-])[O-].[K+].[K+].[Br:19][C:20]1[CH:27]=[CH:26][C:23]([CH2:24]Br)=[C:22]([F:28])[CH:21]=1.Cl>CN(C)C=O.ClC1C=CC=CC=1.O>[Br:19][C:20]1[CH:27]=[CH:26][C:23]([CH2:24][N:9]2[C:10]3[C:6](=[CH:5][CH:4]=[CH:3][C:2]=3[Cl:1])[C:7](=[O:12])[C:8]2=[O:11])=[C:22]([F:28])[CH:21]=1A suspension of 7-chloroindoline-2,3-dione (15g.) and potassium carbonate (15 g.) in N,N-dimethylformamide (100 ml.) was stirred and treated with a solution of 4-bromo-2-fluorobenzyl bromide (24.7 g.) in chlorobenzene (100 ml.). The mixture was stirred at 90° C. for five hours, cooled to ambient temperature, and diluted with a mixture of water (500 ml.) and petrol ether (b.p 60°-80° C.) (500 ml). The aqueous phase was adjusted to pH3 with 10 M hydrochloric acid. The mixture obtained was separated by filtration. The solid obtained was washed with further petrol ether, then with water, and recrystallised from ethanol to give 1-(4-bromo-2-fluorobenzyl)-7- chloro-indoline-2,3-dione (15.5 g.), m.p. 164°-166° C.
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