Based on the optical rotation or specific rotation, how can you tell if the (R)-enantiomer is...
Based on the optical rotation or specific rotation, how can you tell if the (R)-enantiomer is in excess as opposed to the (S)-enantiomer being in excess?
Homework Answers
1 chiral molecules rotate the plane of polarized light ,
2 optical rotation and specific rotation are the measure of degree of rotation
3 if plane of polarized light rotated dextro that is clock wise the optical rotation and specific rotation values are written as + alpha degree , and - alpha for levo rotatory for anticlock.
4 there is no certain connection between R ,S with dextro or levo rotation of plane of polarized light , we can't say if any chiral compound rotats plane of polarized light clock wise then , it will be R or S can't be predicted,
5 but yes , enantiomeric excesss and optical purity only define about the domination of R and S configuration.
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Based on the optical rotation or specific rotation, how can you
tell if the (R)-enantiomer is...
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11. Enantiopurity - How pure a substance is in one enantiomer over the other is expressed as a % enantiomeric excess. Consider the following theoretical scenario: CH2OH CH2OH optical rotation: +100° optical rotation: -100° % composition % enantiomeric excess observed rotation In the lab, a polarimeter can give you optical purity (% enantiomeric excess) by comparing against a pure enantiomeric standard: Optical purity = specific rotation of sample - X 100 specific rotation of pure enantiomer Page 2 A mixture...
2) Natural epinephrine (with a specific rotation of -50°) is used medicinally. Its enantiomer is medically wort...
2) Natural epinephrine (with a specific rotation of -50°) is used medicinally. Its enantiomer is medically worthless and is, in fact, toxic. You, a pharmacist, are given a solution said to contain epinephrine, but the optical purity is not mentioned. You place it in a polarimeter and get an observed optical rotation of -150. What is the enantiomeric excess of natural epinephrine? How much of each enantiomer is in the mixture? You must show your work to get credit.
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the R-(+) enantiomer of a certain compound has a specific rotation of +52. A mixture of this compound with its enantiomer has a has an observed rotation of -26. what is the %ee of this sample and which enantiomer is in excess? what is the ration of R:S in this mixture?
2. The optical activity, measured by specific rotation, of pure (R-malic acid is [a]20D-+27% What is...
2. The optical activity, measured by specific rotation, of pure (R-malic acid is [a]20D-+27% What is the specific rotation of a mixture of 50% and 50% of (R)-malic acid and (S)-malic acid? What is enantiomeric excess of a sample of malic acid containing both enantiomers that has a [al20D -0% [a]20D-27"; [a]20D-_ 13.5": [a]20D-+ 13.5°
Additional Practice Problems If pure R enantiomer has a specific rotation of +33 degrees, what will be the rotation whe...
Additional Practice Problems If pure R enantiomer has a specific rotation of +33 degrees, what will be the rotation when you have a mixture of R/S = 44/56? WILEY Klein, Organic Chemistry 2e Copyright 2015 John Wiley & Sons, Inc. All rights reserved. 5-95 Additional Practice Problems Determine the relationship between the pairs below. CICI WILEY 5 06 Klein Organic Chemistry 2e
A student measured the specific rotation of a mixture and found it to be 10.00 degrees....
A student measured the specific rotation of a mixture and found it to be 10.00 degrees. If the specific rotation for the pure R enantiomer is 40.00 degrees, then what is the enantiomeric excess of the solution? What is the actual composition of R and S enantiomers?
repared a limonene sample with a concentration of 0.044 g/mL and measured an optical rotation of a=8.78 degrees usi...
repared a limonene sample with a concentration of 0.044 g/mL and measured an optical rotation of a=8.78 degrees using a 20 cm polarimeter tube. Calculate the specific rotation () of the students limonene sample and write your answer in the box. (review Example 1 in the procedure for how to do this) 6. If a mixture of (R) and (S)-Limonene Acid gives a %ee of 80.35% favoring the R enantiomer, use this to calculate the ratio of R to S...
if a sample contains 83% of the R enantiomer and 17% of the S, what is...
if
a sample contains 83% of the R enantiomer and 17% of the S, what is
the enantiomeric sxcess?
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A. What is the percentage enantiomeric excess of a product if the observed specific rotation is...
A. What is the percentage enantiomeric excess of a product if the observed specific rotation is +44 degree. but the specific rotation of the pure enantiomer is +56 degree? b. Is the compound predominantly R or S stereoisomer? Discuss why a liquid-liquid extraction usually involves several small steps (say, 3 times 20 ml) rather than one big (say. 1 times 60 ml). Describe the set-up and theoretical principle in a fractional distillation. Include a discussion of the concept of a...
3.34 The specific rotation of (S)-carvone (at +20°C) is +61. A chemist prepared a mixture of (R)- OF (R)- carvone a...
3.34 The specific rotation of (S)-carvone (at +20°C) is +61. A chemist prepared a mixture of (R)- 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. Enantiopurity - How pure a substance is in one enantiomer over the other is expressed as a % enantiomeric excess. Consider the following theoretical scenario: CH2OH CH2OH optical rotation: +100° optical rotation: -100° % composition % enantiomeric excess observed rotation In the lab, a polarimeter can give you optical purity (% enantiomeric excess) by comparing against a pure enantiomeric standard: Optical purity = specific rotation of sample - X 100 specific rotation of pure enantiomer Page 2 A mixture...
2) Natural epinephrine (with a specific rotation of -50°) is used medicinally. Its enantiomer is medically worthless and is, in fact, toxic. You, a pharmacist, are given a solution said to contain epinephrine, but the optical purity is not mentioned. You place it in a polarimeter and get an observed optical rotation of -150. What is the enantiomeric excess of natural epinephrine? How much of each enantiomer is in the mixture? You must show your work to get credit.
2. The optical activity, measured by specific rotation, of pure (R-malic acid is [a]20D-+27% What is the specific rotation of a mixture of 50% and 50% of (R)-malic acid and (S)-malic acid? What is enantiomeric excess of a sample of malic acid containing both enantiomers that has a [al20D -0% [a]20D-27"; [a]20D-_ 13.5": [a]20D-+ 13.5°
Additional Practice Problems If pure R enantiomer has a specific rotation of +33 degrees, what will be the rotation when you have a mixture of R/S = 44/56? WILEY Klein, Organic Chemistry 2e Copyright 2015 John Wiley & Sons, Inc. All rights reserved. 5-95 Additional Practice Problems Determine the relationship between the pairs below. CICI WILEY 5 06 Klein Organic Chemistry 2e
repared a limonene sample with a concentration of 0.044 g/mL and measured an optical rotation of a=8.78 degrees using a 20 cm polarimeter tube. Calculate the specific rotation () of the students limonene sample and write your answer in the box. (review Example 1 in the procedure for how to do this) 6. If a mixture of (R) and (S)-Limonene Acid gives a %ee of 80.35% favoring the R enantiomer, use this to calculate the ratio of R to S...
if
a sample contains 83% of the R enantiomer and 17% of the S, what is
the enantiomeric sxcess?
the following compound is optically active or not. all 2019 Achical Be No 3 Br 03 pts.] If a sample contains 83% of the R enantiomer and 17% of the S enantiomer vhat is the enantiomeric excess of the mixture. 3 pts.1 What is the specific rotation of a sample of carvone that is an equal mixture the R and S...
A. What is the percentage enantiomeric excess of a product if the observed specific rotation is +44 degree. but the specific rotation of the pure enantiomer is +56 degree? b. Is the compound predominantly R or S stereoisomer? Discuss why a liquid-liquid extraction usually involves several small steps (say, 3 times 20 ml) rather than one big (say. 1 times 60 ml). Describe the set-up and theoretical principle in a fractional distillation. Include a discussion of the concept of a...
3.34 The specific rotation of (S)-carvone (at +20°C) is +61. A chemist prepared a mixture of (R)- 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?
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