E.g. (CH)2CH-O一C-H CH,-OC-CH2 IUPAC name: 1-methylethyl methanoate phenyl benzoate methyl 2-phenylethanoate common name isopropyl formate phenyl benzoate methyl phenylacetate 0 CH Ph一CH2一O一C一CH一CH CH一O -0-C-H IUPAC name: benzyl 2-methylpropanoate methyl cyclopentanecarboxylate cyclohexyl methanoate common name: benzyl isobutyrate methyl cyclopentanecarboxylate cyclohexyl formate A cyclic ester is called a lactone,and IUPAC names of lactones are derived by adding the term lactone at the end of the name of the parent carboxylic acid it came from. E.g. Hc-C OH HC-C H2C-C +H2O H2C. C-OH 4-hydroxybutanoic 4-hydroxybutanoic acid acid lactone Ch21 Carboxylie acid Derivatives(landscape) Page 2 Ch21 Carboxylic acid Derivatives(landscape) Page 2 E.g. A cyclic ester is called a lactone, and IUPAC names of lactones are derived by adding the term lactone at the end of the name of the parent carboxylic acid it came from. E.g. H2C H2C C H2 OH OH C O H2C H2C C H2 O C O + H2O 4-hydroxybutanoic acid 4-hydroxybutanoic acid lactone