反应详情

温度

90 °C

In accordance with the process of Example 1, the aqueous solution containing sodium carbonate and 2-[4,4'-bis-(dimethylamino)-benzhydryl]-5-dimethylaminobenzoic acid and cobalt complex of 1-[(2-hydroxynaphthyl)azo]-2-hydroxybenzene-5-sulfonic acid, was heated at 90° C. and 1.6 wt. parts of oxygen was fed into it under the atmospheric pressure during 5 hours, and the precipitate was separated by a filtration and washed with a dilute aqueous solution of sodium hydroxide and with water to obtain 40.7 wt. parts of 3,3-bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide having a melting point of 181° to 183° C.

1. customthe precipitate was separated by a filtration
2. washwashed with a dilute aqueous solution of sodium hydroxide and with water