Cl.[CH3:2][NH:3][CH3:4].[C-:5]#[N:6].[Na+].[S:8]1[CH:12]=[CH:11][CH:10]=[C:9]1[CH:13]=O>O.CO>[CH3:2][N:3]([CH3:4])[CH:13]([C:9]1[S:8][CH:12]=[CH:11][CH:10]=1)[C:5]#[N:6]A solution of 131.5 g. of dimethylamine hydrochloride in 200 ml of water was stirred and 59 g of sodium cyanide added. A solution of 112 g of 2-thiophenecarboxaldehyde in 100 ml of methanol was added from a dropping funnel while the temperature was kept below 30° C. The mixture was then maintained at 30° C. for 4 hours; it was then poured into 3 1. of water.
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