What is the enantiomeric excess (% ee) of a sample of carvone which exhibits a specific rotation of 55 given that the specific rotation of (S)-carvone is 61? Does the unknown sample primarily have the R or S absolute configuration? *Pick two answers. S 90 74 It is a racemic mixture. 66 R 85

What is the enantiomeric excess (% ee) of a sample of carvone which exhibits a specific rotation of 55 given that the specific rotation of (S)-carvone is 61? Does the unknown sample primarily have the R or S absolute configuration? *Pick two answers. S 90 74 It is a racemic mixture. 66 R 85

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter3: Stereoisomerism And Chirality

Section3.7: Optical Activity—how Chirality Is Detected In The Laboratory

Problem 3.10P

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Concept explainers

Stereochemistry and Isomerism

Stereochemistry deals with the three-dimensional structure and properties of molecules. It explains the arrangement of atoms and their manipulation within a molecule in a 3D structure. Stereochemistry can be dealt with all types of molecules. Based on the stereochemistry of a molecule, the physical and chemical properties of the molecules vary.

Question

What is the enantiomeric excess (% ee) of a sample of carvone which exhibits a specific rotation of 55 given that the specific rotation of (S)-carvone is 61?
Does the unknown sample primarily have the R or S absolute configuration?
*Pick two answers.
S
90
90
74
It is a racemic mixture.
66
R
85

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The specific rotation of (S)-carvone (at 20 degrees) is +61. A chemist prepared a mixture of (R)-carvone and its enantiomer, and this mixture had an observed rotation of -55. (a) What is the specific rotation of (R)-carvone at 20 degrees?
The specific rotation of (S)-carvone (at 20 degrees) is +61. A chemist prepared a mixture of (R)-carvone and its enantiomer, and this mixture had an observed rotation of -55. (a) What is the specific rotation of (R)-carvone at 20 degrees? (b) What percentage of the mixture is (S)- carvone? Choose from the following options. 1. 90% (S)-carvone and 10% (R) 2. 10% (S)-carvone and 90% (R) 3. 95% (S)-carvone and 5% (R) 4. 5% (S)- carvone and 95% (R)
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