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 Copyright2010 Pearson Prentice Hall,Inc. ■Reaction of一OH and一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. 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