[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[C:5]([OH:9])=[CH:4][C:3]=1[N:10]1[C:14](=[O:15])[N:13]([CH:16]([F:18])[F:17])[C:12]([CH3:19])=[N:11]1.Cl[CH:21]([F:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23].[Na]>C(O)C.C(OCC)C>[Cl:8][C:6]1[CH:7]=[C:2]([Cl:1])[C:3]([N:10]2[C:14](=[O:15])[N:13]([CH:16]([F:17])[F:18])[C:12]([CH3:19])=[N:11]2)=[CH:4][C:5]=1[O:9][CH:21]([F:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23]To a stirred mixture of 2.0 g (0.0065 mole) of 1-(2,4-dichloro-5-hydroxyphenyl)-4-difluoromethyl-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one and 0.91 g (0.0065 mole) of ethyl chlorofluoroacetate in 50 mL of ethanol was added a solution of 0.15 g (0.0065 mole) of sodium in 5 mL of ethanol. The reaction mixture was heated at reflux for 34 hours. The mixture was cooled, and the solvent was removed by evaporation under reduced pressure, leaving a residue. This residue was dissolved in diethyl ether, and the solution was washed first with water, followed by an aqueous 10% sodium hydroxide solution. The organic phase was dried over anhydrous magnesium sulfate, then filtered. The filtrate was evaporated under reduced pressure to yield 0.95 g of ethyl [2,4-dichloro-5-(4-difluoromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenoxy]fluroacetate as an oil, Compound 51.
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