Benzenedicarboxylic acid is a group of chemical compounds which are dicarboxylic derivatives of benzene. Benzenedicarboxylic acid comes in three isomers:
- Phthalic acid (1,2-benzenedicarboxylic acid)
- Isophthalic acid (1,3-benzenedicarboxylic acid)
- Terephthalic acid (1,4-benzenedicarboxylic acid)
| Common Name | Phthalic acid | Isophthalic acid | Terephthalic acid |
| Systematic Name | 1,2-benzenedicarboxylic acid | 1,3-benzenedicarboxylic acid | 1,4-benzenedicarboxylic acid |
| Structural Formula | 
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| CAS Registry Number | 88-99-3 | 121-91-5 | 100-21-0 |
All isomers share the molecular weight 166.13 g/mol and the chemical formula C8H6O4.
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