Answer
IUPAC Name: 2,2,5,5-Tetramethylhex-3-yne
This article explains the step-by-step process to determine the IUPAC name of a hydrocarbon with multiple substituents and a triple bond.
🔬 Step 1: Identify the Parent Chain
The longest continuous carbon chain that includes the triple bond has 6 carbon atoms. Hence, the root name is hex. Because of the triple bond, we use the suffix -yne, making it hexyne.
🔢 Step 2: Number the Carbon Chain
The carbon chain is numbered to give the triple bond the lowest number. The triple bond lies between carbon atoms 3 and 4, resulting in the name hex-3-yne.
🌿 Step 3: Identify Substituents
There are four methyl groups:
- Two methyl groups at carbon 2
- Two methyl groups at carbon 5
Total: 2,2,5,5-tetramethyl
🧪 Step 4: Assemble the Name
Combining the information:
Final IUPAC Name: 2,2,5,5-Tetramethylhex-3-yne
✅ Summary
- Parent Chain: 6 carbon atoms → hex
- Triple bond at C-3: hex-3-yne
- Substituents: Four methyl groups → tetramethyl
- Positions: 2,2,5,5
This is a clear example of how substituent positions and bond types influence the structure’s systematic IUPAC name.