反应详情

100 g of pinacolone (1 mole) were initially introduced into a stirred flask and 154.5 g (1.5 moles) of sulfur dichloride were added dropwise in the course of 2 hours at 20°-40° C., whilst stirring and cooling slightly, HCl being released via a condenser. After the mixture had been further stirred for 1 hour at 40° C., a solution of 90 g (2 moles) of dimethylamine in water (as an approximately 40% strength solution) was allowed to run in, over the course of about 30 minutes, at 60°-80° C., while cooling with water and the mixture was stirred for a further 30 minutes at the same temperature. A solution of 140 g (3.5 moles) of NaOH in 300 ml of water was then added and the mixture was heated under reflux for 4-6 hours, dimethylamine being released as a gas via the condenser and being absorbed in water. After cooling to 60°-70° C., the pH of the mixture was adjusted to 3.0 with hydrochloric acid (hydrogen sulfide being released as a gas and being absorbed in sodium hydroxide solution) and elemental sulfur, which had precipitated at the same time, was filtered off. 106 g (1.0 mole) of thiocarbohydrazide were added to the clear filtrate and the mixture was reacted at pH 1 and 50°-80° C. to give 6-tert.-butyl-3-mercapto-4-amino-1,2,4-triazin-5(4H)-one. This was very sparingly soluble in the reaction medium and could easily be isolated by filtering off. Yield: 150 g (or 75% of theory).

1. temperaturecooling slightly
2. stirringAfter the mixture had been further stirred for 1 hour at 40° C.
3. customover the course of about 30 minutes
4. stirringthe mixture was stirred for a further 30 minutes at the same temperature
5. temperaturethe mixture was heated
6. temperatureunder reflux for 4-6 hours
7. custombeing absorbed in water
8. temperatureAfter cooling to 60°-70° C.
9. custombeing absorbed in sodium hydroxide solution) and elemental sulfur, which
10. customhad precipitated at the same time
11. filtrationwas filtered off
12. customthe mixture was reacted at pH 1 and 50°-80° C.