Multiple Choice
Provide the full name for the following molecule, taking stereochemistry into account.
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5. Chirality
R and S Configuration
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What is the absolute configuration of the following stereocenters?
A
I: S, II: S
B
I: R, II: R
C
I: R, II: S
D
I: S, II: R
Verified step by step guidance1
Identify the stereocenters in the molecule. In the given structure, there are two stereocenters labeled as I and II.
For stereocenter I, assign priorities to the substituents based on atomic number. The substituents are the ethyl group, the cyclohexane ring, the hydrogen (implied), and the carbonyl group.
Orient the molecule so that the lowest priority group (hydrogen) is pointing away from you. Then, determine the order of the remaining groups from highest to lowest priority.
Trace the path from the highest priority group to the lowest priority group. If the path is clockwise, the configuration is R. If it is counterclockwise, the configuration is S.
Repeat the process for stereocenter II, assigning priorities to the substituents, orienting the molecule, and determining the configuration based on the path traced.
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