The locations of
substituents are indicated by Greek letters, a a¢, b b¢ and so on
beginning with the carbon atoms next to the carbonyl group,
indicated as aa¢ Some ketones have historical common names,
the simplest dimethyl ketone is called acetone Alkyl phenyl
ketones are usually named by adding the name of acyl group as
prefix to the word phenone For example
(b) IUPAC names
The IUPAC names of open chain aliphatic aldehydes and ketones
are derived from the names of the corresponding alkanes by
replacing the ending –e with –al and –one respectively