. (+) 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 +14.88⁰ ? Select one: O A. 60% (+) chloramphenicol and 40 % (-)
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- 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.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
- 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?5. Solution A contains 9 g of pure (-)-fructose was diluted to 500 mL with water and placed in a polarimeter tube 20 cm long. The measured rotation was -3.31°. a. Calculate the specific rotation of the compound in the solution. b. If Solution A were mixed with 500 mL of a solution containing 2 g of racemic fructose (Solution B), what would be the optical purity (% enantiomeric excess) of the resulting fructose mixture?Thalidomide exists in two enantiomeric isomers as shown below. N (R) NI(S) O If a solution is prepared by adding a 50:50 ratio of two enantiomers what will be the expected observed rotation? Explain your answer in 1-2 sentences.
- 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)2. The observed rotation of a compound, X (14.0g dissolved in water to make 100ml. of solution) in a polarimeter tube of length 30cm is +10.5°. What is the specific rotation of X?13. If the proton-pump inhibitor, (S)-omeprazole, has a specific rotation (rotation of plane polarized light) of -155°, what should the specific rotation of (R)-omeprazole be? a) -155° b) 0° c) +155° d) It can only be determined experimentally
- 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 GroupThe 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?When 0.018 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 at 20 degrees (Using the D line of sodium) is -0.0567 degrees. Calculate the specific rotation of cholesterol. specific rotation= [α] =