Benzenedicarboxylic acid

In organic chemistry, benzenedicarboxylic acid is a systematic name for a chemical with a benzene ring attached to two carboxylic acid groups.

This chemical has three structural isomers, depending on how far apart the acid groups are on the ring:

  • Phthalic acid, when the groups are next to each other
  • Isophthalic acid, when they are one carbon apart
  • Terephthalic acid, when they are opposite each other
Name Phthalic acid Isophthalic acid Terephthalic acid
Structure
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