Dicarboxylic Acids Aliphatic diacids are usually called by their common names (to be memorized). For IUPAC name,number the chain from the end closest to a substituent. Two carboxyl groups on a benzene ring indicate a phthalic acid. COOH Br HOOCCH2CHCH2CH2COOH COOH 3-bromohexanedioic acid 1,3-benzenedicarboxylic acid β-bromoadipic acid m-phthalic acid => Chapter 20 6Chapter 20 6 Dicarboxylic Acids • Aliphatic diacids are usually called by their common names (to be memorized). • For IUPAC name, number the chain from the end closest to a substituent. • Two carboxyl groups on a benzene ring indicate a phthalic acid. HOOCCH2 CHCH2 CH2 COOH Br 3-bromohexanedioic acid -bromoadipic acid COOH COOH 1,3-benzenedicarboxylic acid m-phthalic acid =>