反应详情

To the compound (I) (27.0 g/0.142 mol) were added potassium hydrogensulfate (7 g) and 4-tert-butylcatechol (polymerization inhibitor, 0.01 g). The mixture was distilled at 150° to 180° C. using an oil bath to collect the whole distillate. Ether (20 ml) was added to the distillate, an ethereal layer was separated from water, and sodium sulfate was added to the layer for dehydration, followed by filtration. The ether was removed from the filtrate, to which 4-tert-butylcatechol was added again. The filtrate was then distilled at a reduced pressure, giving 4-trifluoromethylstyrene [compound (II)] represented by the formula CF3C6H4CH=CH2, b.p. 78°~80° C. (2660 Pa), colorless transparent liquid, yield 76.5%.

1. distillationThe mixture was distilled at 150° to 180° C.
2. distillationto collect the whole distillate
3. additionEther (20 ml) was added to the distillate
4. customan ethereal layer was separated from water, and sodium sulfate
5. additionwas added to the layer for dehydration
6. filtrationfollowed by filtration
7. customThe ether was removed from the filtrate, to which 4-tert-butylcatechol
8. additionwas added again
9. distillationThe filtrate was then distilled at a reduced pressure