# Why IUPAC name this amine is written as 2-methylpropan-2-amine and not as 2,2-dimethylethanamine? [closed]

Why IUPAC Nomenclature of following amine is written as 2-methylpropan-2-amine and not as as 2,2-dimethylethanamine?

• "2,2-dimethylethanamine" is not only a wrong name, it also describes a different compound. – Loong Feb 13 at 19:35
• This question is tagged with "amine"; however, the numbering of 2-methylpropan-2-amine is not limited to amines. You can see the analogous numbering for example in 2-methylpropan-2-ol and 2-chloro-2-methylpropane. Can you spot your mistake now? – Loong Feb 13 at 19:41

The basic principle in nomenclature is to look for the longest carbon chain: here it is the chain with 3 carbon atoms so the suffix prop; since it is an amine connecting to the carbon 2 it gives the suffix propan-2-amine. As you have a $$\ce {CH_3}$$ group grafted in position 2 of the main carbon chain, you must add the prefix 2-methyl