The IUPAC name of (CH3)3CCOCH2CH3 is 2,2-dimethylpropanoyl ethane or alternatively, 3,3-dimethylbutanoyl ethane.
Here's how to derive the IUPAC name:
1. Identify the parent chain: The longest continuous chain containing the functional group is the parent chain. In this case, the parent chain is ethane.
2. Identify the substituents: The (CH3)3C- group is a substituent, and it is attached to the parent chain at the second carbon.
3. Number the parent chain: Number the carbon atoms of the parent chain starting from the end that gives the substituent the lower number. In this case, it doesn't matter which end you start numbering from, as both carbons are equivalent.
4. Name the substituents: The (CH3)3C- group is a tert-butyl group. It is attached to the second carbon of the ethane chain, so we use the prefix "2,2-dimethyl-" or "3,3-dimethyl-".
5. Name the functional group: The functional group is a carbonyl group (-CO-) attached to the first carbon of the ethane chain. The suffix "-oyl" is used to indicate this functional group.
6. Combine the names: Putting it all together, we get either 2,2-dimethylpropanoyl ethane or 3,3-dimethylbutanoyl ethane, depending on which carbon you consider to be the first carbon of the parent chain.