IUPAC Name of C₉H₁₈ | 1-ethyl-3-methylcyclohexane
What is the IUPAC name of C₉H₁₈?
The IUPAC name of C₉H₁₈ is 1-ethyl-3-methylcyclohexane. It is a cycloalkane with a 6-carbon parent chain (cyclohexane) with substituents: ethyl at position 1, methyl at position 3.
| Formula | C₉H₁₈ |
| IUPAC Name | 1-ethyl-3-methylcyclohexane |
| Compound Class | Cycloalkane |
| Parent Chain | cyclohexane (6 carbons) |
| Substituents | ethyl at C1, methyl at C3 |
| Difficulty | Advanced |
Step 1: Identify the Parent Chain
The longest continuous carbon chain in C₉H₁₈ contains 6 carbon atoms, giving the parent name cyclohexane. The parent structure is based on a carbon ring.
Step 2: Number and Name Substituents
Number the parent chain so that substituents receive the lowest possible locants. 1-ethyl-3-methylcyclohexane has 2 substituents:
- ethyl at carbon 1
- 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 1-ethyl-3-methylcyclohexane.
Interactive IUPAC nomenclature explorer with guided walkthroughs and practice quizzes on 66 molecules.
Practice Naming C₉H₁₈ Step by Step