Br[CH2:2][C:3](=[O:8])[C:4]([CH3:7])([CH3:6])[CH3:5].[CH3:9][C:10]1[N:15]=[C:14]([NH:16][C:17](=[S:19])[S-:18])[CH:13]=[CH:12][CH:11]=1.C([NH+](CC)CC)C.C(OC(C)C)(C)C>C(#N)C>[CH3:9][C:10]1[N:15]=[C:14]([NH:16][C:17](=[S:18])[S:19][CH2:2][C:3](=[O:8])[C:4]([CH3:7])([CH3:6])[CH3:5])[CH:13]=[CH:12][CH:11]=11-Bromo-3,3-dimethylbutan-2-one (40.0 g) is added to a suspension of triethylammonium (6-methylpyrid-2-yl)dithiocarbamate (64.0 g) in anhydrous acetonitrile (600 cc) at a maximum temperature of 20° C. The reaction is continued for 2 hours at 20° C. The insoluble hydrobromide of triethylamine is removed by filtration and washed with acetonitrile (50 cc). The organic phases are combined and evaporated under reduced pressure (20 mm.Hg) at 45° C. The residual oil is treated with diethyl ether (1200 cc). After 1 hour at 20° C., the ethereal solution is filtered, washed twice with distilled water (total 400 cc), dried over sodium sulphate and evaporated. The product obtained (60.0 g) is dissolved in boiling diisopropyl ether (870 cc) and the boiling solution is filtered. After 1 hour's cooling at 2° C., the resulting crystals are filtered off, washed twice with ice-cold diisopropyl ether (total 100 cc) and dried under reduced pressure (0.1 mm.Hg) at 40° C. to give 3,3-dimethyl-2-oxobutyl (6-methylpyrid-2-yl)dithiocarbamate (44.1 g) melting at 80° C.
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