[C:1]([C:5]1[CH:6]=[C:7]2[C:12](=[CH:13][CH:14]=1)[C:10](=[O:11])[O:9][CH2:8]2)([O:3]C)=[O:2].C[O-].[Na+].[F:18][C:19]1[CH:26]=[CH:25][CH:24]=[CH:23][C:20]=1[CH:21]=O.Cl>CO.O>[F:18][C:19]1[CH:26]=[CH:25][CH:24]=[CH:23][C:20]=1[CH2:21][CH2:8][C:7]1[CH:6]=[C:5]([C:1]([OH:3])=[O:2])[CH:14]=[CH:13][C:12]=1[C:10]([OH:9])=[O:11]8.5 G. of 5-carbomethoxyphthalide and 2.43 g. of sodium methoxide were refluxed for 15 minutes in 250 ml of methanol, and then 5.55 g. of o-fluorobenzaldehyde was added. The mixture was refluxed for 20 hours and then poured into water and acidified with dilute hydrochloric acid. The solution was extracted with ethyl acetate and the extract washed, dried and evaporated. The residue was refluxed for 48 hours in 75 ml of acetic acid and 45 ml of 57% aqueous hydriodic acid containing 7.5 g. of red phosphorus. The mixture was poured into water and filtered. The residue was dissolved in ethanol and the solution filtered and evaporated to afford 2-(o-fluorophenethyl)benzene-1,4-dicarboxylic acid which was cyclized according to the method described in Example I, A to obtain 2-carboxy-9-fluoro-10,11-dihydro-5-oxo-5H-dibenzo[a,d]cycloheptene having a m.p. of 248.5° to 249.5° C.
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