[CH3:1][NH2:2].[N:3]1[CH:8]=[CH:7][CH:6]=[C:5]([C:9]2([C:14]([S:16]C)=S)[CH2:13][CH2:12][CH2:11][S:10]2)[CH:4]=1.C>C(O)C>[CH3:1][NH:2][C:14]([C:9]1([C:5]2[CH:4]=[N:3][CH:8]=[CH:7][CH:6]=2)[CH2:13][CH2:12][CH2:11][S:10]1)=[S:16]A 33% (weight/volume) solution of methylamine in ethanol (11 cc) is added dropwise, in the course of 5 minutes, to a solution of methyl 2-(pyrid-3-yl)-tetrahydrothiophen-2-carbodithioate (14.3 g) in ethanol (50 cc), kept at a temperature of about 20° C. The solution is subsequently stirred for 5 hours at the same temperature and then cooled to 0° C. The resulting crystals are filtered off, washed with ethanol (8 cc) and then twice with diisopropyl ether (20 cc in total) and dried under reduced pressure (20 mm Hg; 2.7 kPa) at 20° C. The product thus obtained (7.2 g) is dissolved in boiling ethanol (35 cc); decolourising charcoal (0.4 g) is added to the solution, which is filtered hot, and the filtrate is then cooled for 1 hour at a temperature of about 5° C. The resulting crystals are filtered off, washed with ethanol (5 cc) and then twice with diisopropyl ether (14 cc in total) and dried under reduced pressure (1 mm Hg; 0.13 kPa) at 40° C. N-Methyl-2-(pyrid-3-yl)-tetrahydrothiophen-2-carbothioamide (5.8 g), melting at 133° C., is thus obtained.
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