Reaktion #1467577

Reaktionsgleichung

Hydrogen sulphide

2-(N-cyanimino)-hexahydropyrimidine

NaOH

→

product

Ausbeute 94.0%

2-(N-Thiocarbamoylimino)-hexahydropyrimidine

Ausbeute 94.0%

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISSOLUTION(On the second day, some of the precipitate no longer dissolves)
2. 2
   workup.WAITis continued for 30 minutes
3. 3
   Filtrationfiltered off with suction
4. 4
   SonstigeAfter drying

Vorschrift

Hydrogen sulphide is first passed into a solution of 190 g (1.53 mols) of 2-(N-cyanimino)-hexahydropyrimidine (a) in 760 ml of water at 75° C. for 12 hours; and then at 65°-70° C. for another 25-30 hours. (On the second day, some of the precipitate no longer dissolves). The suspension is then warmed to 45° C. and 46 ml of 40% strength NaOH are added. Stirring is continued for 30 minutes and the residue is ground and filtered off with suction. After drying, 228 g (94%) of product are obtained. Melting point=187°-189° C. (decomposition).

Quelle