HuagongsheHuagongshe Chemistry Print Report · For research reference only
HRID 2298702Generated: October 25, 2026
2,5-Dianilinoterephthalic acid → Quinacridone
https://huagongshe.com/reaction/2298702
Participants
| Role | Name | HCID | Charge |
|---|
| Reactant | 2,5-Dianilinoterephthalic acid | HCID 82351 | — |
| Reactant | 1,4-Benzenedicarboxylic acid, 2,5-bis[(4-methoxyphenyl)amino]- | HCID 3084837 | — |
| Solvent | Methanol | HCID 887 | — |
| Product | Quinacridone | HCID 13976 | — |
Reaction Steps
A mixture (one part) of 2,5-dianilino-terephthalic acid (95%) and 2,5-dianisidino-terephthalic acid (5%) was dissolved in polyphosphoric acid (6.14 parts at 118.5%). The solution, already at 100° C., was heated to 133° C. for 3 hours, cooled and diluted. The solution was drowned into methanol (11.6 parts) and heated at 120° C. for 4 hours. A very bluish, transparent quinacridone pigment, dispersible in an automotive finish, was obtained.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
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| Patent number | US06494949B2 |
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| Source dataset | uspto-grants-2002_12 |
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| ORD ID | ord-de17842ae26e4b99a747535771943f47 |
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| Source note | uspto-grants-2002_12 |
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