Calculate (a) the optical purity of a mixture of 3.5 g (-)-menthol and 2.7 g (+) - menthol. know opriccu (b) What is the observed rotation of the mixture if the specific rotation of (-)- menthol is -4&
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- (+)-menthol has a specific rotation of +50°. A mixture of (+)-menthol and (-)-menthol in a certain synthetic sample was analyzed as follows. 6.972 g of sample was dissolved to make a 25 mL solution, and then placed in a 10 cm tube. The optical rotation of the solution was -10°. What is the enantiomeric excess of the mixture? Report your answer to the correct number of significant figures. % ee Which enantiomer (+ or -) corresponds to the major enantiomer present? )-menthol What are the percentages of each enantiomer in the mixture? Report your answer to the correct number of significant figures. % (+)-menthol % (-)-menthol3 @Calculate (a) the optical purity of a mixture of 3.5 g (-) - menthol and 2.7 g (+) - menthol. (b) What is the observed rotation of the mixture if the specific rotation of (-) - menthol is -48.(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 ?
- 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 Media8. Consider the structure of Quinine, an antimalarial drug below with an optical rotation of -165º. (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. N,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.
- 3. A solution of enantiomers has an observed specific rotation of +8.0°ml/g dm and pure (+) enantiomer has a specific rotation of +12'ml/g dm. Determine the optical purity and ratio of the enantiomers in the mixture.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?(c) If the specific rotation of an enantiomeric mixture is +12.5° and that of the pure enantiomer is +50°, then what will be the % of optical purity of the dextro-isomer in the enantiomeric mixture. (i) 10% (ii) 2.5% (iii) 25% (iv) 50%
- 2. A 1.50 g sample of coniine, the toxic extract of poison hemlock, was dissolved in 10.0 mL of ethanol and placed in a sample cell with a 5.00 cm pathlength. The observed rotation at the sodium D line was +1.21°. Calculate [a]p for coniine. 3. Rank the substituents in each of the following sets: (а) -Н, -ОН, -СH2CH3, -СH2СH,ОН (b) -СОозН, -СО,CH3, -СH2ОН, -он (c) -CN, –CH2NH2, -CH2NHCH3, –NH2 (d) –SH, –CH2SCH3, –CH3, -SSCH31.5 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?Me/H 3.8 Me/Me 15.5 You are trying to determine the optical purity (% enantiomeric excess) of a compound that you have just synthesized. You measure the rotation of plane-polarized light of a 0.5 g/mL solution and find the rotation to be +16.2 degrees (clockwise). Given the pure (-) isomer has a specific rotation of -45 degrees, what is the optical purity of the compound? Show, work. your