Which organic nomenclature is correct?
5,6-dimethyl-2-heptanone or 5,6-dimethylhept-2-one
i saw it written as 5,6-dimethyl-2-heptanone but why can't i name it as 5,6-dimethylhept-2-one?
5,6-dimethyl-2-heptanone or 5,6-dimethylhept-2-one
i saw it written as 5,6-dimethyl-2-heptanone but why can't i name it as 5,6-dimethylhept-2-one?
1 Answer
May 19, 2018
The correct IUPAC name is 5,6-dimethylheptan-2-one.
Explanation:
The "old" IUPAC rules accepted 5,6-dimethyl-2-heptanone as the name.
The "new" IUPAC rules require the locant (the locating number) to be as close as possible to the name of the functional group.
The preferred IUPAC name (PIN) is now
5,6-dimethylheptan-2-one
Both names are acceptable, but only the new one is the correct IUPAC name.
