Pyridine → N-chlorothio-N-(3,4-dichlorophenyl)-N',N'-dimethyl urea

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A 5.7-g (0.055 mol) sample of sulfur dichloride was added dropwise to a mixture of 11.7 g (0.05 mol) of N-(3,4-dichlorophenyl)-N',N'-dimethyl urea and 4.7 g (0.06 mol) pyridine in 50 ml methylene chloride cooled in an ice bath. After the completion of the addition, the pyridine hydrochloride was filtered. Hexane was added to precipitate additional pyridine hydrochloride, which was removed by filtration. Evaporation of the resulting filtrate gave the product as a clear yellow oil. The NMR spectrum showed an N',N'-dimethyl singlet at 3.0 ppm (relative to tetramethylsilane). Elemental analysis showed:

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