IUPAC Nomenclature Ketones CI 2-me thyl-3-pe ntanone 2,7-dichlorocyclohe ptanone Br Br 1-phe nyl-1-propanone (R)6,6-dibromo-5-cyclope ntyl-2-he ptanone propiophe none (common) IUPAC Nomenclature Ketones O 2-methyl-3-pentanone O Cl Cl 2,7-dichlorocycloheptanone O 1-phenyl-1-propanone propiophenone (common) Br Br O (R) 6,6-dibromo-5-cyclopentyl-2-heptanone