[F:1][C:2]1[CH:9]=[C:8]([CH:10]2[CH2:15][CH2:14][C:13](=[CH:16][O:17][CH3:18])[CH2:12][CH2:11]2)[CH:7]=[CH:6][C:3]=1[C:4]#[N:5].[CH:19](/[CH:24](CO)[CH2:25][OH:26])=[CH:20]\[CH2:21][CH2:22][CH3:23].C1(C)C=CC=CC=1>S(=O)(=O)(O)O.O>[F:1][C:2]1[CH:9]=[C:8]([C@H:10]2[CH2:15][CH2:14][C@H:13]([C@H:16]3[O:26][CH2:25][C@H:24](/[CH:19]=[CH:20]/[CH2:21][CH2:22][CH3:23])[CH2:18][O:17]3)[CH2:12][CH2:11]2)[CH:7]=[CH:6][C:3]=1[C:4]#[N:5]A mixture of 0.98 g of 2-fluoro-4-[4-(methoxymethylidene)cyclohexyl]benzonitrile (U.S. Pat. No. 4,784,471), 0.70 g of 2-(1E-pentenyl)-1,3-propanediol, 45 ml of toluene, 2 ml of water and 10 drops of 10 percent sulphuric acid was stirred at about 85° C. for 75 minutes, then heated to boiling for 1 hour, whereby moist solvent distilled off and was replaced by fresh toluene. The reaction mixture was treated with 12 drops of triethylamine and, after cooling, washed three times with 15 ml of water, dried over sodium sulphate, filtered and concentrated. Chromatography of the residue (1.86 g) on 50 g of silica gel with hexane/ethyl acetate (vol. 9:1) and two-fold recrystallization from 8 ml of hexane each time gave 0.65 g of pure 2-fluoro-4-[trans-4-[trans-5-(1E-pentenyl)-1,3-dioxan-2-yl]cyclohexyl]benzonitrile, m.p. (C-N) 91.2° C., cl.p. (N-I) 192.5° C.
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