2,5-Di-p-toluidinoterephthalic acid → 5,12-Dihydro-2,9-dimethylquino(2,3-b)acridine-7,14-dione

Participants

Reaction Steps

2,5-Bis{(4-methylphenyl)amino}terephthalic acid (3.76 gm; 10 mmol) and polyphosphoric acid (40 gm) were heated at 150° C. for 2.5 hours under a nitrogen atmosphere. The mixture was allowed to cool and then poured into iced water (100 ml) when a magenta solid precipitated out. This was filtered off, washed with water and then methanol, then dried under vacuum over phosphorous pentoxide to give 3.12 gm (92%) of 2,9-dimethylquinacridone.

Provenance & Evidence