[CH2:1]([O:3][CH:4]([O:12][CH2:13][CH3:14])[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=1Br)[CH3:2].C([Li])CCC.[F:20][C:21]1[CH:28]=[CH:27][CH:26]=[CH:25][C:22]=1[CH:23]=[O:24]>O1CCCC1.CCCCCC>[CH2:1]([O:3][CH:4]([O:12][CH2:13][CH3:14])[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=1[CH:23]([C:22]1[CH:25]=[CH:26][CH:27]=[CH:28][C:21]=1[F:20])[OH:24])[CH3:2]A solution of 345 g of 2-bromobenzaldehyde diethyl acetal in 3 l of dry tetrahydofuran was cooled to -40° C. In one portion, 913 ml of a 1.6 M solution of butyllithium in hexane were added under vigorous stirring. The resulting solution was stirred for 0.5 h at -25° C., after which a solution of 140 ml of 2-fluorobenzaldehyde in 350 ml tetrahydrofuran was added drop-wise. In a period of 4 h, the mixture was allowed to reach room temperature. The resulting mixture was pored upon ice-water and extracted several times with ethyl acetate. The organic layers were combined, washed with water, dried over magnesium sulphate and evaporated to dryness under reduced pressure to yield 404 g of 2-(diethoxymethyl)-α-(2-fluorophenyl)-benzenemethanol as an oil, M.S. (C.I.) (M/Z): 305 [M+H]+.
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