反应详情

A mixture of 31.3 g of (5-p-chlorophenyl-1-phenyl-pyrazol-4-yl)-acetic acid, 10.9 g of o-aminophenol and 400 ml of polyphosphoric acid is heated at 175° for 2 hours. After cooling and the customary working up, 5-p-chlorophenyl-1-phenyl-4-(benzoxazol-2-ylmethyl)-pyrazole is obtained; m.p. 137°-139°.

1. temperatureis heated at 175° for 2 hours
2. temperatureAfter cooling