Potassium Persulfate → 2,3-Dichloro-1-oxo-1lambda~5~-pyrazine
Reaction equation
[Cl:1][C:2]1[C:7]([Cl:8])=[N:6][CH:5]=[CH:4][N:3]=1.S(OOS([O-])(=O)=O)([O-])(=O)=[O:10].[K+].[K+]>S(=O)(=O)(O)O>[Cl:1][C:2]1[C:7]([Cl:8])=[N:6][CH:5]=[CH:4][N+:3]=1[O-:10]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a stirred solution of 15 grams (0.1 mole) of 2,3-dichloropyrazine in 120 milliliters of concentrated sulfuric acid, maintained at 5° C, was gradually added 30 grams (0.11 mole) of potassium persulfate. The reaction mixture was stirred overnight at room temperature and thereafter poured into 400 milliliters of ice water. The resulting solution was thoroughly extracted with chloroform and the extract washed with both a saturated sodium bicarbonate solution and a saturated sodium chloride solution and dried over magnesium sulfate. The chloroform was thereafter removed by evaporation leaving the 2,3-dichloropyrazine-1-oxide as a white solid residue. The product was recrystallized from methanol and was recovered in a yield of 14.0 grams (85 percent of theoretical). The product melted at 104°-106° C, and upon analysis was found to have carbon, hydrogen, nitrogen and chlorine contents of 29.40, 1.41, 17.08 and 43.20 percent, respectively, as compared with the theoretical contents of 29.09, 1.21, 16.97 and 43.03 percent, respectively, calculated for the above-named compound.
Workup
- extractionThe resulting solution was thoroughly extracted with chloroform
- washthe extract washed with both a saturated sodium bicarbonate solution
- dry with materiala saturated sodium chloride solution and dried over magnesium sulfate
- customThe chloroform was thereafter removed by evaporation
Sources & evidence
- ORD record
- ord-a5d83245e4834e1fa4101749c4606338
- Source dataset
- uspto-grants-1978_07
- Patent number
- US04101546
Reaction notes
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