[F:1][C:2]1[CH:18]=[CH:17][C:5]([CH:6]=[CH:7][C:8]([C:10]2[CH:15]=[CH:14][C:13]([F:16])=[CH:12][CH:11]=2)=[O:9])=[CH:4][CH:3]=1>O1CCCC1.[Ni]>[F:1][C:2]1[CH:18]=[CH:17][C:5]([CH2:6][CH2:7][C:8]([C:10]2[CH:11]=[CH:12][C:13]([F:16])=[CH:14][CH:15]=2)=[O:9])=[CH:4][CH:3]=1A solution of 59.9 g of 4,4'-difluorobenzylideneacetophenone in 600 ml of tetrahydrofuran is hydrogenated in the presence of 6 g of Raney nickel. After removal of the catalyst, the reaction mixture is concentrated by rotary evaporation, affording the title compound of the formula ##STR8## as a crude product with a refractive index of n20D =1.5478.
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