An enantiomerically enriched sample of 2-butanol has an observed optical rotation of 6.7°. Enantiomerically pure (S)-(+)-2-butanol has a specific rotation of +13.5°. Use this information to answer the following questions. a) What is the optical purity of the mixture? 49.6 %ee in favor of the S isomer b) What is the ratio of the S and R enantiomers in the mixture? 74.8 % Sisomer, 25.2 % R isomer c) If the ratio of enantiomers were adjusted to 9:1, what would be the optical purity of the sample? 80 %ee d) What ratio of enantiomers is needed to obtain an optical purity of 99%? 99.5 0.5 (R) (S) :
An enantiomerically enriched sample of 2-butanol has an observed optical rotation of 6.7°. Enantiomerically pure (S)-(+)-2-butanol has a specific rotation of +13.5°. Use this information to answer the following questions. a) What is the optical purity of the mixture? 49.6 %ee in favor of the S isomer b) What is the ratio of the S and R enantiomers in the mixture? 74.8 % Sisomer, 25.2 % R isomer c) If the ratio of enantiomers were adjusted to 9:1, what would be the optical purity of the sample? 80 %ee d) What ratio of enantiomers is needed to obtain an optical purity of 99%? 99.5 0.5 (R) (S) :
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:An enantiomerically enriched sample of 2-butanol has an observed optical rotation of 6.7°.
Enantiomerically pure (S)-(+)-2-butanol has a specific rotation of +13.5°. Use this information to answer the following questions.
a) What is the optical purity of the mixture? 49.6
%ee in favor of the S isomer
b) What is the ratio of the S and R enantiomers in the mixture?
74.8
% Sisomer,
25.2
% R isomer
c) If the ratio of enantiomers were adjusted to 9:1, what would be the optical purity of the sample?
80
%ee
d) What ratio of enantiomers is needed to obtain an optical purity of 99%? 99.5
0.5
(R)
(S) :
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