[Br:1][C:2]1[C:3]([CH:9]([CH3:11])[CH3:10])=[N:4][N:5]([CH2:7]O)[CH:6]=1.S(Cl)([Cl:14])=O>ClCCl>[ClH:14].[Br:1][C:2]1[C:3]([CH:9]([CH3:11])[CH3:10])=[N:4][N:5]([CH2:7][Cl:14])[CH:6]=11.29 g of 4-bromo-3-i-propyl-1H-pyrazole-1-ylmethanol was dissolved to 20 ml of dichloromethane. 2 ml of thionyl chloride was added to the solution, followed by stirring at room temperature for overnight. The reaction mixture was concentrated under reduced pressure to obtain 1.28 g of 4-bromo-3-i-propyl-1-(chloromethyl)-1H-pyrazole hydrochloride.
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