Water → [5-(3,5-dichloro-phenylsulphanyl)-3-methyl-1-phenyl-1H-pyrazol-4-yl]methanol

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A mixture of 1.35 g of 5-(3,5-dichlorophenylthio)-3-methyl-1-phenyl-1H-pyrazole-4-carboxaldehyde and 0.84 g of sodium borohydride in 10 ml of methanol was stirred at room temperature for 30 minutes. Water (10 ml) was added and the mixture was extracted four times with 15 ml of diethyl ether. Combined extracts were dried over magnesium sulphate, filtered and evaporated to leave 670 mg of [5-(3,5-dichloro-phenylsulphanyl)-3-methyl-1-phenyl-1H-pyrazol-4-yl]-methanol as a grey paste which was used without further purification. Mass spectrum (ES) m/z 365 [M+H]+, 406 [M+H+CH3CN]+.

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