Try Mixture of 2-butanol enantiomers showed a specific rotation of +6.76. What is the composition of this mixture given the specific rotation of pure (S)-(+)-2- butanol and (R)-(-)-2-butanol to be + 13.52 and -13.52 respectively. >A sample of 2-methyl-1-butanol has a specific rotation, [a]35 = + 1.151. If the specific rotation of the pure R enantiomer [a = + 5.756. (a) What is the percent enantiomeric excess of the sample? (b) Which enantiomer is in excess, the (R) or the (S)?

Try Mixture of 2-butanol enantiomers showed a specific rotation of +6.76. What is the composition of this mixture given the specific rotation of pure (S)-(+)-2- butanol and (R)-(-)-2-butanol to be + 13.52 and -13.52 respectively. >A sample of 2-methyl-1-butanol has a specific rotation, [a]35 = + 1.151. If the specific rotation of the pure R enantiomer [a = + 5.756. (a) What is the percent enantiomeric excess of the sample? (b) Which enantiomer is in excess, the (R) or the (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...

See similar textbooks

Similar questions

8. The specific rotation of (S)-carvone (at +20°C) 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°C? (b) Calculate the % ee of this mixture. (c) What percentage of the mixture is (S)-carvone?
(11) The specific rotation of (R) -2-bromooctane is -36 . What is the percentage composition of a mixture of enantiomers of 2-bromooctane whose rotation is +12 ?
If a sample of 2-butanol has a specific rotation of +3.25o, determine the %ee and the molecular composition of this sample. The specific rotation of pure (+) 2-butanol is 13.0o.
Specific rotation, [a]p of (S)-2-butanol at 25°C is +13,52°. Enantiomeric excess (%ees) of a mixture of (R)-2-butanol and (S)-2-butanol having specific rotation of + 6.76° at 25°C is Select one: O A. 60% O B. 50% O C. 20% O D. 75%
A solution prepared by mixing 10 mL of a 0.10 M solution of the R enantiomer of a compound and 30 mL of a 0.10 M solution of the S enantiomer was found to have an observed specific rotation of +4.8. What isthe specific rotation of each of the enantiomers? (Hint: mL * M = millimole, abbreviated as mmol)
If the optical rotation of a pure enantiomer A is +10 and the optical rotation of a mixture of two enantiomers (A+B) is -4 (Negative 6), what is the percentage of A and B in that mixture?
The following compound has a chiral centre. Explain why it has four stereoisomers. H3CC(Cl)HCH=CHCH2CH3. And calculate the specific rotation of each enantiomer in a mixture containing 10 mL (0.10 M) of the S enantiomer and 30 mL(0.10M) of the R enantiomer. Given the specific rotation of mixture=+4.8
8. Consider the structure of Quinine, an antimalarial drug below with an optical rotation of -165°. (a) Draw the structure and identify (by a star) all stereogenic centres present in the Quinine structure. (b) Calculate the ee of the solution with the following [a] values: -50 and -120 (c) For each calculated ee, compute percentage of each enantiomer present. (d) What is the enantiomer of Quinine? (e) If the solution contains 80% quinine and 20% of it enantiomer, what is the ee of the solution? Но. H3CO.
(iii) Calculate the specific rotation of each enantiomer in a mixture containing 10 mL (0.10 M) of (2S, 3R, 5S) enantiomer and 30 mL (0.10 M) of (2R, 3S, 5R) enantiomer. Given the specific rotation of the mixture = +4.8°.
5. The specific rotation of (S)-2-iodobutane is +15.90°. Draw the structure of (S)-2- iodobutane, predict the specific rotation of (R)-2-iodobutane, and determine the percentage composition of a mixture of (R)- and (S)-2-iodobutane with a specific rotation of -7.95°.
7.(a) Draw and label (i) the enantiomer and (ii) a pair of diasteromers of the following compound. OH (b) Will a 50:50 mix of the enantiomers that you drew for 7al be optically active (rotate plane polarized light). Explain the reason for your answer b) Will a 50:50 mix of the two diasteriomers_you drew for 7bii be optically active (rotate plane polarized light). Explain the reason for your answer
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?