衣林 Cyclic Esters (y-butyrolactone) Reaction of -OH and on same molecule produces a Y一丁内酯 cyclic ester,lactone. To name,add word lactone to the IUPAC acid name or replace the -ic acid of common (8-valerolactone)name with -olactone. δ一戊内酯 (y-valerolactone) CH3 Y一戊内酯 4-hydroxy-2-methylpentanoic acid lactone a-methyl-y-valerolactone O O O O O O ( γ-butyrolactone) γ －丁内酯 ( δ-valerolactone) δ －戊内酯 ( γ-valerolactone) γ －戊内酯 Cyclic Esters ™Reaction of -OH and -COOH on same molecule produces a cyclic ester, lactone. ™To name, add word lactone to the IUPAC acid name or replace the -ic acid of common name with -olactone. O O H 3 C CH 3 4-hydroxy-2-methylpentanoic acid lactone α-methyl- γ-valerolactone