Cyclic Esters H,C CH3 IUPAC name: 5-hydroxypentanoic acid lactone 4-hydroxy-2-methylpentanoic acid lactone common name: 8-valerolactone a-methyl-y-valerolactone Copyright 2010 Pearson Prentice Hall,Inc. Reaction of-OH and-COOH on same molecule produces a cyclic ester called lactone. To name,add the word lactone to the IUPAC acid name or replace the -ic acid of common name with -olactone. Chapter 21 5Chapter 21 5 Cyclic Esters ▪ Reaction of —OH and —COOH on same molecule produces a cyclic ester called lactone. ▪ To name, add the word lactone to the IUPAC acid name or replace the -ic acid of common name with -olactone