IUPAC Name of C₅H₈ | 3-methylbut-1-yne
What is the IUPAC name of C₅H₈?
The IUPAC name of C₅H₈ is 3-methylbut-1-yne. It is a alkyne with a 4-carbon parent chain (but-1-yne) with a methyl at position 3 substituent.
| Formula | C₅H₈ |
| IUPAC Name | 3-methylbut-1-yne |
| Compound Class | Alkyne |
| Parent Chain | but-1-yne (4 carbons) |
| Substituents | methyl at C3 |
| Difficulty | Intermediate |
Step 1: Identify the Parent Chain
The longest continuous carbon chain in C₅H₈ contains 4 carbon atoms, giving the parent name but-1-yne. The parent chain must include the carbon-carbon triple bond.
Step 2: Number and Name Substituents
Number the parent chain so that substituents receive the lowest possible locants. 3-methylbut-1-yne has one substituent:
- methyl at carbon 3
Step 3: Assemble the IUPAC Name
Combine the substituent locants and names (in alphabetical order) as prefixes to the parent chain name. If two or more identical substituents are present, use the multiplying prefixes di-, tri-, tetra-, etc. The complete IUPAC name is 3-methylbut-1-yne.
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