Dibromomethane → Potassium diphenylmethyldithiocarbamate

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Potassium diphenylmethyldithiocarbamate was prepared from diphenylmethyl isothiocyanate and potassium hydrosulfide in a t-butyl alcohol acetone mixture. A mixture of 29.7 g. of this salt, 26.1 g. of methylene bromide, and 10.1 g. of triethylamine in 200 ml. of dimethylformamide was stirred for about 1 hour keeping the initial reaction temperature below 30°C. by cooling. The mixture was poured into ice-water, partitioned into ethylene chloride, and gave 24.0 g. of crude product upon evaporation of the ethylene chloride. Purification by dry column chromatography on silica gel using 20% methylene chloride in hexane for developing gave 5.5 g. of solids which were recrystallized from isopropyl alcohol to give 4.4 g. of white crystals, m.p. 106.5°-107.5°C.

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