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青州's Question
Chemistry
Posted 6 months ago

What is the IUPAC name of the following compound?
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Answer from Sia
Posted 6 months ago
Solution
1
Identify the longest carbon chain: The longest carbon chain in the molecule serves as the parent hydrocarbon. In this case, the longest chain contains four carbon atoms, which corresponds to the prefix "butane"
2
Number the carbon chain: The carbon chain should be numbered from the end nearest to the substituents to give the lowest possible numbers to the substituents. Here, numbering from the left gives the substituents on the second and third carbons
3
Identify and number the substituents: There are three methyl groups as substituents. According to the numbering from step 2, there is one methyl group on the second carbon and two methyl groups on the third carbon
4
Assemble the name: The IUPAC name is constructed by combining the substituent names with the parent chain name, using hyphens to separate numbers and commas to separate multiple numbers. The substituents are listed in alphabetical order
Answer
2,3-Dimethylbutan-1-one
Key Concept
IUPAC nomenclature of ketones
Explanation
The IUPAC name for a ketone is derived from the longest carbon chain containing the carbonyl group, with the carbonyl carbon numbered to have the lowest possible number. Substituents are named and numbered accordingly.

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