O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O.C(O)C.[F:18][C:19]1[CH:20]=[C:21]([O:25][CH2:26][C:27]2[CH:35]=[CH:34][CH:33]=[CH:32][C:28]=2[C:29]([OH:31])=O)[CH:22]=[CH:23][CH:24]=1>O>[F:18][C:19]1[CH:24]=[CH:23][C:22]2[C:29](=[O:31])[C:28]3[CH:32]=[CH:33][CH:34]=[CH:35][C:27]=3[CH2:26][O:25][C:21]=2[CH:20]=1To 250 g of phosphorus pentoxide is slowly added 160 ml of ethanol at room temperature. The mixture is further stirred with heating at 100° C. for 1 hour. Thereto 42 g of 2-[(3-fluorophenyloxy)methyl]benzoic acid is added and the mixture is stirred with heating at 100° C. for 1 hour. After cooling to room temperature, 500 ml of water is added. After extraction with toluene, washing successively with saturated sodium hydrogen carbonate, water and a saturated saline solution and drying over magnesium sulfate, the solvent is distilled off under reduced pressure to give 31 g of 3-fluoro-6,11-dihydrodibenz[b,e]oxepin-11-one (oil). Mass spectrum m/z: 228(M+).
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