Hydrogen Peroxide → HCID 14098716, compound

Reaction equation

[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:13](=[O:14])[CH2:12][CH:11]3[CH2:15][S:16][C:17]4[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=4[C:10]3=[N:9]2)=[CH:4][CH:3]=1.[OH:23]O.O>C(O)(=O)C>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[C:13](=[O:14])[CH2:12][CH:11]3[CH2:15][S:16](=[O:23])[C:17]4[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=4[C:10]3=[N:9]2)=[CH:6][CH:7]=1

Participants

Procedure

To a mixture of 11.5 g of 2-(4-chlorophenyl)-2,3,4,4a-tetrahydro-5H-(1)benzothiopyrano[4,3-c]pyridazin-3-one in 200 ml of acetic acid is added 66 ml of 35% hydrogen peroxide dropwise with stirring at room temperature. After the completion of addition, the mixture is stirred at room temperature for 3 hours, poured into an excess amount of water and extracted with chloroform. The extract is washed with water, dried over magnesium sulfate anhydride and the chloroform is distilled off under reduced pressure. To the precipitated crystals is added diisopropyl ether. The crystals are collected by filtration and recrystallized from isopropyl alcohol to give 7.7 g of 2-(4-chlorophenyl)-2,3,4,4a-tetrahydro-5H-(1)benzothiopyrano[4,3-c]pyridazin-3-one 6-oxide, melting at 181°-183° C., as colorless needles.