[CH3:1][N:2]1[C:6]([C:7]2[S:11][C:10]([C:12](O)=[O:13])=[CH:9][CH:8]=2)=[CH:5][C:4]([C:15]([F:18])([F:17])[F:16])=[N:3]1.C(Cl)(=O)C([Cl:22])=O.CN(C=O)C>ClCCCl>[CH3:1][N:2]1[C:6]([C:7]2[S:11][C:10]([C:12]([Cl:22])=[O:13])=[CH:9][CH:8]=2)=[CH:5][C:4]([C:15]([F:18])([F:17])[F:16])=[N:3]1A mixture of 5-(1-methyl-3-trifluoromethyl-1H-pyrazol-5-yl)thiophene-2-carboxylic acid, oxalyl chloride, DMF and DCE was stirred at room temperature for 90 minutes and then treated in the usual way to give 5-(1-methyl-3trifluoromethyl-1H-pyrazol-5-yl)thiophene-2-carbonyl chloride as a brown solid.
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