Question

1. use the iupac rules to name the following structures.

a. $ch_{3}ch = chchch_{3}$
$\vert$
$ch_{3}$
b. $ch_{3}$
$\vert$
$ch_{2}$
$\vert$
$ch_{3}chch_{2}ch = chcch_{3}$
$\vert$
$ch_{3}$

Explanation:

Step1: Determine the parent chain

For part a, the longest chain containing the double bond has 6 carbon atoms. For part b, the longest chain with the double bond has 8 carbon atoms.

Step2: Number the chain

For part a, number the chain so that the double bond gets the lowest number. The double bond is between C - 2 and C - 3. For part b, number the chain to give the double bond the lowest number. The double bond is between C - 5 and C - 6.

Step3: Identify substituents

For part a, there is a methyl group on C - 4. For part b, there is an isopropyl group (from the \(CH(CH_3)_2\) part) on C - 2 and methyl groups on C - 7.

Step4: Name the compound

For part a:

• The parent chain is hexene (6 - carbon alkene).
• The double bond position is 2.
• The substituent (methyl) is at 4. So the name is 4 - methyl - 2 - hexene.

For part b:

• The parent chain is octene (8 - carbon alkene).
• The double bond position is 5.
• The substituents: 2 - isopropyl (from \(CH(CH_3)_2\) at C - 2) and 7 - methyl (methyl at C - 7). So the name is 2 - isopropyl - 7 - methyl - 5 - octene.

Answer:

a. 4 - methyl - 2 - hexene
b. 2 - isopropyl - 7 - methyl - 5 - octene