Questions: Consider the stereoisomers (A-E) drawn below: Which structure is an enantiomer of structure A? structure B structure C structure D structure E

Consider the stereoisomers (A-E) drawn below: Which structure is an enantiomer of structure A? structure B structure C structure D structure E
Transcript text: Consider the stereoisomers (A-E) drawn below: Which structure is an enantiomer of structure A? structure B structure C structure D structure E
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Solution

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Solution Steps

Step 1: Identify the configuration of structure A
  • Structure A has the following groups around the chiral center: CHO, Br, NH2, and CH2OH.
  • Determine the configuration (R or S) of structure A by assigning priorities to the groups based on atomic number and using the Cahn-Ingold-Prelog priority rules.
Step 2: Determine the configuration of the other structures
  • Similarly, determine the configuration (R or S) of structures B, C, D, and E by assigning priorities to the groups around their chiral centers.
Step 3: Identify the enantiomer of structure A
  • An enantiomer is a non-superimposable mirror image of the original molecule, meaning it will have the opposite configuration (R vs. S) at the chiral center.
  • Compare the configurations of structures B, C, D, and E with that of structure A to find the one with the opposite configuration.

Final Answer

  • Structure E is the enantiomer of structure A.
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