反应详情

To a solution of 35.4g (0.2 mole) 4-phenyl urazole in 200 ml water was added a solution of 16g (0.4 mole) sodium hydroxide in 20 ml water. A mixture of 74.4g (0.4 mole)trichloromethylsulfenyl chloride and 3g of an emulsifier solution (EXEM 25, consisting of a mixture of alkyl benzene sulfonate and ethoxylated vegetable oil) in 50 ml water was added dropwise to the above basic solution while keeping the reaction mixture at 0° C. The reactants were mixed so that the reaction mixture was kept at a pH greater than 7. The precipitate that formed was filtered and the filter cake was washed with water. After drying and recrystallizing from benzene there was obtained 4-phenyl-1,2-bis-(trichloromethylthio)urazole having a melting point of 175° C.

1. additionwas added dropwise to the above basic solution
2. customat 0° C
3. additionThe reactants were mixed so that the reaction mixture
4. customThe precipitate that formed
5. filtrationwas filtered
6. washthe filter cake was washed with water
7. customAfter drying
8. customrecrystallizing from benzene