p-Toluidine → 1,4,5,8-Tetrakis(4-methylanilino)anthracene-9,10-dione

Beteiligte Stoffe

Reaktionsschritte

A mixture of 1,4,5,8-tetrachloroanthraquinone (34.6 parts) and p-toluidine (214 parts) was allowed to react at 190° C. for 15 hours. Thereafter, the reaction mixture was cooled, and the precipitate was collected on a suction filter, washed four times with methanol (500 parts) and then twice with hot water (500 parts), and dried to obtain 1,4,5,8-tetra(4'-methylphenylamino)anthraquinone (48.7 parts) as a black solid. The product was recrystallized from toluene to obtain a dark green crystal. The melting point and maximum absorption wave lenggh (λmax measured in acetone) were found to be 268° to 275° C. and 760 nm, respectively.

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