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Magazine Chapter 4: Q.56. (page 128)
Question: Convert each of the following structures into its more stable chair form. One structure represents menthol and one represents isomenthol. Menthol, the more stable isomer, is used in lip balms and mouthwash. Which structure corresponds to menthol?
Short Answer
Answer
Menthanol
Step by step solution
Conversion of the cis-trans hexagon into chair conformation
The substituents lying above the plane at the first carbon are represented at the axial position.
- Similarly, the substituents at the second carbon are represented at the equatorial position.
- The substituents at the third carbon are represented at the axial position.
- The substituents at the fourth carbon are represented at equatorial position.
- The substituents at the fifth carbon are represented at the axial position.
- The substituents at the sixth carbon are represented at the equatorial position.
Stability of cis and trans conformations
The stability of the conformations depends upon the location of the substituents. If all bulky substituents are located at the equatorial positions, the conformation will be more stable and vice versa.
Explanation
The conversion of cis-trans hexagon into stable chair conformation is shown as:
Stable chair conformation of menthanol
Stable chair conformation of isomenthanol
Menthanol is the more stable conformation because all substituents of this molecule are located at an equatorial position.
Methanol (all substituents are at equatorial position)
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