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Organic Chemistry - Some Basic Principles and Techniques
IUPAC Nomenclature: Compounds with Double and Triple Bonds
1 question from 1 paper, each with its answer.
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Concepts tested
- Naming enynes
All Questions
2002 AIPMT 1 question
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IUPAC name of the following is $CH_2=CH-CH_2-CH_2-C\equiv CH$The chain has six carbons with one C=C and one C$\equiv$C bond, so it is a hexenyne.
When a double and a triple bond are at equivalent distances from the two ends, the double bond gets the lower number. Numbering from the C=C end: double bond at C-1, triple bond at C-5.
The ending '-ene' is written before '-yne'.
So the name is 1-hexene-5-yne (modern form: hex-1-en-5-yne).