1,4-Benzenedicarboxylic acid, 2,5-bis[(4-chlorophenyl)amino]- → Quino[2,3-b]acridine-7,14-dione, 2,9-dichloro-5,12-dihydro-

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Reaction Steps

2,5-Bis{(4-chlorophenyl)amino}terephthalic acid (3.35 gm; 8 mmol) and polyphosphoric acid (30 gm) were heated at 150° C. for 3 hours under a nitrogen atmosphere. The mixture was allowed to cool and then poured into iced water (200 ml) when a magenta solid precipitated out. This was filtered off, washed with water and methanol, then dried under vacuum over phosphorous pentoxide to give 3.1 gm (100%) of 2,9-dichloroquinacridone.

Provenance & Evidence