Open Question
Propene. What does the name of this hydrocarbon tell you about its molecular structure?
22. Organic Chemistry
Naming Alkenes
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Provide systematic name for given alkene.
A
trans-2,7-dimethyl-3-octene
B
2,7-dimethyl-3-octane
C
trans-2,7-dimethyl-5-octene
D
2,7-dimethyl-5-octane
Verified step by step guidance1
Identify the longest carbon chain that contains the double bond. In this case, the longest chain has 8 carbon atoms, which makes it an octene.
Number the carbon chain starting from the end nearest to the double bond. This ensures the lowest possible numbers for the double bond and substituents.
Locate the position of the double bond. The double bond starts at carbon 3, so the base name is 3-octene.
Identify and name the substituents. There are methyl groups attached to carbons 2 and 7, so they are named as 2,7-dimethyl.
Determine the stereochemistry of the double bond. The groups on either side of the double bond are on opposite sides, indicating a trans configuration. Therefore, the systematic name is trans-2,7-dimethyl-3-octene.
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