反应详情

5-Amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-trifluoromethylthiopyrazole (4.0 g) was added to triethyl orthoformate (19.0 ml) and p-toluene/-sulphonic acid (0.019 g) added. The mixture was heated under reflux for 21 hours, cooled, and the triethyl orthoformate evaporated in vacuo to give a brown oil as residue. This was purified by chromatography eluting with a mixture of dichloromethane and hexane (1:1). Evaporation of the eluates in vacuo gave 3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-5-ethoxymethyleneamino-4-trifluoromethylthiopyrazole as a colourless solid, m.p. 70°-71.5° C.

1. additionadded
2. temperatureThe mixture was heated
3. temperatureunder reflux for 21 hours
4. temperaturecooled
5. customthe triethyl orthoformate evaporated in vacuo
6. customto give a brown oil as residue
7. customThis was purified by chromatography
8. washeluting with a mixture of dichloromethane and hexane (1:1)
9. customEvaporation of the eluates in vacuo