. (+) Chloramphenicol is a powerful antibiotic isolated in 1949 from the Streptomyces venezuelae bacterium. Its specific rotation is +18.6°. What is the composition of a mixture of (+) and (-) chloramphenicol whose observed specific rotation is +14.88° ? Select one: A. 60% (+) chloramphenicol and 40 % (-) chloramphenicol B. 70% (+) chloramphenicol and 30 % (-) chloramphenicol C. 90% (+) chloramphenicol and 10 % (-) chloramphenicol D. 80% (+) chloramphenicol and 20 % (-) chloramphenicol

. (+) Chloramphenicol is a powerful antibiotic isolated in 1949 from the Streptomyces venezuelae bacterium. Its specific rotation is +18.6°. What is the composition of a mixture of (+) and (-) chloramphenicol whose observed specific rotation is +14.88° ? Select one: A. 60% (+) chloramphenicol and 40 % (-) chloramphenicol B. 70% (+) chloramphenicol and 30 % (-) chloramphenicol C. 90% (+) chloramphenicol and 10 % (-) chloramphenicol D. 80% (+) chloramphenicol and 20 % (-) chloramphenicol

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter24: Amines And Heterocycles

Section24.SE: Something Extra

Problem 40MP

See similar textbooks

Similar questions

Note: enantiomers have similar physical properties (mp, density, solubility), and same [a], but with different signs ( - or +). Practice: 1.2 gm sample of cocaine, [a], = -16º, was dissolved in 7.5 mL of chloroform and placed in a sample tube having a pathlength of 5 cm. what was the observed rotation in degrees?
An enantiopure naturally occurring sugar had a specific rotation of +136. A synthetic sample of this sugar gave a rotation of +84°, when a sample of concentration 1.37 g/100 ml was placed in a cell with a path length of 20 cm. (i) Which of the following prefixes could be used to describe this compound (on the basis of the information provided) +/-, d/l, D/L, R/S? (ii) Calculate the ee of the synthetic sample.
The specific rotation, [a]p, for (-)-malic acid is -27. What is the observed rotation for a solution of 0.75 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees. The observed rotation of a solution of 1.4 g of a compound in 10 mL of water is +1.3 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? 9 more group attempts remaining Submit Answer Retry Entire Group
6:18 D-fructose Linear form
The specific rotation of α-d-galactose is 150.7 and that of β-d-galactose is 52.8. When an aqueous mixture that was initially 70% α-d-galactose and 30%β-d-galactose reaches equilibrium, the specific rotation is 80.2. What is the percentage of α-d-galactose and β-d galactose at equilibrium?
The specific rotation, [a]p, for (-)-malic acid is -27. What is the observed rotation for a solution of 1.2 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? | degrees. The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is +0.75 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? 9 more group attempts remaining Submit Answer Retry Entire Group
The anticoagulant heparin is a polysaccharide that contains alternating residues of -D- glucuronic acid-6- sulfate and N-sulfo-D-glucosamine-6sulfate connected by (1 B 4)- glycosidic linkages. Draw a part of heparin that shows one each of the two residues.
1.5 A solution of R(-)-Methadone was prepared by mixing 6 g of R(-)-methadone with ethanol to create a 40 mL solution. The sample was measured using a 200 mm polarimeter tube. The observed rotation was 4.05 in the counterclockwise direction. Calculate the specific rotation of R(-)-methadone. 1.6 What is the specific rotation of the enantiomer of R-methadone? 1.7 If in the synthesis of Methadone, the R(-)-methadone was generated in 80% ee, how much of the R-methadone and S-methadone is present in the product in percent?
When 0.066 g of cholesterol is dissolved in 1.00 mL of ether and placed in a sample cell 10.0 cm in length, the observed rotation 20°C (using the D line of sodium) is -0.208°Calculate the specific rotation of cholesterol. specific rotation [a] = i eTextbook and Media
The specific rotation for (-)-methylphenidate is -38° mL g¹ dm¯1. Path length of the polarimeter is 1 dm. 1 You dissolve 0.5 g of a mixture of (-)-methylphenidate and its enantiomer in 4 mL of water. You place the sample into a polarimeter and the observed rotation is found to be -0.2°. What percent of the mixture is composed of (-)- methylphenidate? (Round your answer to the nearest whole percent.) The numerical values in this calculation will change with each attempt. Double check before submitting additional attempts. 17
Honey bees collect nectar which is approximately 10% sucrose and convert it into honey (a concentrated solution of about 40% each of glucose and fructose). They do this conversion by mixing the nectar with the salivary enzyme invertase then busily aerating and fanning the solution to drive off water. Given the specific rotation of sucrose (+66.5°), glucose (+52.7°) and fructose (-92°). Calculate the rotation that accomplishes honey production
Compound A is a D-aldopentose that can be oxidized to an optically inactive aldaric acid B. On Kiliani-Fischer chain extension, A is converted into C and D; C can be oxidized to an optically active aldaric acid E, but D is oxidized to an optically inactive aldaric acid F. What is the structure of compound F? • Use the wedge/hash bond tools to indicate stereochemistry where it exists. You do not have to explicitly draw H atoms. If a group is achiral, do not use wedged or hashed bonds on it. • Show stereochemistry in a meso compound. • Do not include lone pairs in your answer. They will not be considered in the grading.