4-(4-Hydroxyphenylimino)cyclohexa-2,5-dienone?with Sodium polysulfide solution heating, in 111 ~ 112 ℃ under reflux 40 ~ 50 hours, in 45 ℃ blowing air or in a dilute Sodium hydroxide solution by air oxidation, make its precipitation. This indophenol?is by 4-Aminophenol and phenol with a mixture of Sodium hypochlorite oxidation and have to.
