反应详情

First, one mole of solid 3,4-dicyano-1,2,5-thiadiazole (II) is suspended in a quantity of water sufficient to obtain an easily stirrable mixture. Then, under stirring, there are admixed from 0.01 to 0.8 mole of KOH in the form of an aqueous solution. There occurs an exothermic reaction which is controlled by cooling so as to maintain a temperature of about 20° to 50° C. At this stage the 3,4-dicyano-1,2,5-thiadizole (II) passes into solution, hydrating to form 3-cyano-4-carbamoyl-1,2,5-thiadiazole (III), which may be separated as a solid if one operates at 20° to 35° C, or which will remain in solution if one operates at higher temperatures up to 50° C. This ends the first stage of the reaction.

1. customto obtain an easily stirrable mixture
2. customan exothermic reaction which
3. temperatureby cooling so as
4. temperatureto maintain a temperature of about 20° to 50° C