Methanol → Anthraquinone

Participants

Reaction Steps

1-Amino-2-bromo-4-(3'-β-hydroxyethylsulfonylphenylthio)anthraquinone (5.2 parts) and phenol (9.5 parts) were allowed to react with each other at 100° to 120° C. in dimethylformamide in the presence of potassium carbonate. After completion of the reaction, methanol was added thereto to deposit crystals, which were collected on a filter, well washed with water and then dried at 80° C. The product obtained was subjected to both sulfonation and esterification at 20° to 40° C. in 10% oleum. Thereafter, ice was added to the reaction mixture to deposit crystals, which were collected on a filter to obtain an anthraquinone compound of the following formula (free acid form). ##STR197##

Provenance & Evidence