Common Names Many aliphatic acids have historical names. Positions of substituents on the chain are labeled with Greek letters. 0 -C-C-C-C-C-C-0H NH, CH3-CH一C一OH CH2一CH2-CH2-C一OH a-chloropropionic acid y-aminobutyric acid => Chapter 20 3 Chapter 20 3 Common Names • Many aliphatic acids have historical names. • Positions of substituents on the chain are labeled with Greek letters. =>