[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([N:9]2[CH:13]=[N:12][C:11]([SH:14])=[N:10]2)=[CH:5][CH:4]=1.[OH-].[Na+].CO.S(OC)(O[CH3:23])(=O)=O>O>[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([N:9]2[CH:13]=[N:12][C:11]([S:14][CH3:23])=[N:10]2)=[CH:7][CH:8]=1
A mixture of 8 parts of 1-(4-methoxyphenyl)-1H-1,2,4-triazole-3-thiol; 3.1 parts of sodium hydroxide and 40 parts of methanol is stirred for 30 minutes at room temperature. Then there are added 4.9 parts of dimethyl sulfate and stirring at room temperature is continued for 3 hours. Water is added to the reaction mixture and the product is extracted twice with 1,1'-oxybisethane. The combined extracts are dried, filtered and evaporated. The residue is purified by column-chromatography over silica gel using trichloromethane as eluent. The pure fractions are collected and the eluent is evaporated. The residue is crystallized from 2,2'-oxybispropane, yielding 5.6 parts (65%) of 1-(4-methoxyphenyl)-3-(methylthio)-1H-1,2,4-triazole; mp. 54.9° C.
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