Question

Draw a structural formula for the following alkene: cis-2-methyl-3-hexene

a)Consider E/Z stereochemistry of alkenes.
b)Do not show stereochemistry in other cases.
c)You do not have to explicitly draw H atoms.

Answer 1

The structural formula for cis-2-methyl-3-hexene, considering E/Z stereochemistry, features six carbon atoms with a methyl group on the second carbon and a double bond between the third and fourth carbons. Both the methyl group and the adjacent CH group are on the same side of the double bond, demonstrating the cis configuration.

Step-by-step explanation:

The student has asked for the structural formula of cis-2-methyl-3-hexene. Based on the information, we understand that we need to consider the E/Z stereochemistry for alkenes, specifically, the cis configuration. As the alkene is cis-2-methyl-3-hexene, we need to position the methyl group (CH3) on the second carbon and the double bond between the third and fourth carbons while ensuring both groups are on the same side of the double bond for the cis isomer.

To illustrate the structure:

• The longest carbon chain has six carbon atoms, indicating that it's a hexene.
• A methyl group is attached to the second carbon atom.
• The double bond is located between the third and fourth carbon atoms.
• The cis configuration means that the higher priority groups (the methyl group and the CH group on the third carbon) are on the same side of the double bond.

The structural formula, without explicitly drawing hydrogen atoms, would look like this (the vertical representation illustrates the cis configuration, and the dashes represent the carbon bonds):

CH3
|
CH3-C=C-CH2-CH2-CH3
|
CH3