反应详情

温度

50 °C

A 1000 mL flask is charged with 75.2 g of 5-phenylthio-2-(2-hydroxy-3-α-cumyl-5-tert-octylphenyl)-2H-benzotriazole, prepared in Example 4, 102 g of xylene, 0.9 g of sodium tungstate dihydrate and 18.4 g of formic acid. The mixture is heated to 50° C. To this stirred mixture is slowly added 36.3 g of 50% hydrogen peroxide so that the temperature does not exceed 85° C. Additional xylene and water are then added. The organic layer is separated, washed with aqueous sodium sulfite, then twice with water and concentrated. The crude product residue is recrystallized from methanol to yield 75.2 g of the tide compound as a light yellow solid melting at 170-171° C.

1. customdoes not exceed 85° C
2. customThe organic layer is separated
3. washwashed with aqueous sodium sulfite
4. concentrationtwice with water and concentrated
5. customThe crude product residue is recrystallized from methanol