[Mg].[C:2]([O:10][CH2:11][CH3:12])(=[O:9])[CH2:3][C:4]([O:6][CH2:7][CH3:8])=[O:5].[F:13][C:14]1[C:22]([CH3:23])=[C:21]([F:24])[C:20]([F:25])=[CH:19][C:15]=1[C:16](Cl)=[O:17].S(=O)(=O)(O)O>C1(C)C=CC=CC=1.C(O)C.C(Cl)(Cl)(Cl)Cl>[F:13][C:14]1[C:22]([CH3:23])=[C:21]([F:24])[C:20]([F:25])=[CH:19][C:15]=1[C:16]([CH:3]([C:4]([O:6][CH2:7][CH3:8])=[O:5])[C:2]([O:10][CH2:11][CH3:12])=[O:9])=[O:17]
To a mixture of magnesium turnings (0.69 g) and absolute ethanol (4.7 ml) was added carbon tetrachloride (0.4 ml). To the stirring suspension was added a solution of diethyl malonate (4.41 g) and absolute ethanol (4.7 ml) in anhydrous toluene (19.2 ml) dropwise during 10 minutes at 15° to 50° C. After the mixture was stirred at 50° to 60° C. for 2 hours, to the mixture was added a solution of 2,4,5-trifluoro-3-methylbenzoyl chloride (4.51 g) in anhydrous toluene (6.4 ml) dropwise at -16° to -13° C. during 10 minutes. The reacting mixture was stirred at -20° C. for 1 hour, and then warmed gradually to room temperature during 1.5 hours with stirring. To this solution was added ice water (25 ml) containing concentrated sulfuric acid (0.8 ml), extracted with toluene. The organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous sodium chloride and concentrated under reduced pressure to give the title compound (8.10 g).
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