反应详情

温度

25 °C

A 50% aqueous solution of chloroacetaldehyde (28.4 g) is added, at between 20° and 30° C., to a solution of triethylammonium 6-methylpyrid-2-yldithiocarbamate (51.5 g) in distilled water (225 cc). The reaction mixture is stirred for 2 hours at 25° C. The crude product is filtered off, washed five times with distilled water (total 125 cc) and dried in air. The product obtained (37.0 g; m.p. 128° C.) is dissolved in boiling ethanol (250 cc). After filtering the boiling solution and cooling the filtrate for 2 hours at 2° C., the resulting crystals are filtered off, washed three times with ice-cooled ethanol (total 30 cc) and dried under reduced pressure (0.2 mm Hg) at 40° C. 4-Hydroxy-3-(6-methylpyrid-2-yl)-thiazolidine-2-thione (29.8 g), melting at 128° C., is thus obtained.

1. filtrationThe crude product is filtered off
2. washwashed five times with distilled water (total 125 cc)
3. customdried in air
4. customThe product obtained (37.0 g; m.p. 128° C.)
5. dissolutionis dissolved
6. filtrationAfter filtering the boiling solution
7. temperaturecooling the filtrate for 2 hours at 2° C.
8. filtrationthe resulting crystals are filtered off
9. washwashed three times with ice-
10. temperaturecooled ethanol (total 30 cc)
11. customdried under reduced pressure (0.2 mm Hg) at 40° C