A sample of limonene has a specific rotation of +74.l°. R-(+)-limonene [a]p = +125.6° and S-(-)-limonene [a]p = -122.1'. What is the percent enantiomercic excess (% ee)? % ee: What is the molecular composition of this same sample? percent of S isomer: % percent of R isomer: %
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- The specific rotation of (R)carvone is -61o. A chemist prepared a mixture of (R)-carvone and (S)-carvone, and the mixture had an observed rotation of -47o. What is the % enantiomeric excess (ee) of the mixture?An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +11.5°+11.5°. If it is known that the specific rotation of the ?R enantiomer is −38.0°−38.0°, determine the percentage of each isomer in the mixture.1. A solution of (S)-2-butanol (molar mass = 74.12) is observed to have a rotation in a 10 cm path length of +16.2 degrees. If the molar specific rotation of (S)-2-butanol is +135.2 degrees, what is the concentration of (S)-2-butanol in grams per liter? 2. After an attempt to resolve a racemate into its enantiomers, the observed rotation is +22.4 degrees per g/L. If the known specific rotation is +24.2 degrees per g/L,, what is the % enantiomeric excess of the compound? 3. If the % enantiomeric excess of a chiral compound is 88.2%, what is its chiral purity?
- The specific rotation of (S)-2-iodobutane is +15.90°. Determine the percentage composition of a mixture of (R)- and (S)-2-iodobutane with a specific rotation of -7.95°Assume that (2S,3R)-2-bromo-3-chloropentane has a specific rotation of +58°. What would be the specific rotation of the (2R,3S) isomer?(S)-carvone is an optically active compound with a specific rotation of +61.1°. A solution of carvone stereoisomers has an observed specific rotation of 25.0°. Could someone help me Calculate the percent enantiomeric excess (%ee) of this mixture? I tried it but I keep getting the wrong answer.
- a. The specific rotation for pure R is +5.0, what percentage of the mixture is R when the observed roation is -2.0. b. The rotation for pure S=-100. What is the observed rotation of a mixture that is 20%S and 80%R? I need an easy way to solve these kinds of problem, please!!Draw all stereoisomers of 3,4-hexanediamine. Label each sterocenter with the appropriate R/S designation to show hardness. Indicate the relationship(enantiomers or diasteromers) between every possible pairing of compounds. Label each compound as chiral or achiral, and if there is a mess compound, label it as such.one of these compound has a specific rotation of +6.9 degrees. Which compound might this be? What do you expect the specific rotation of the remaining compound to be?In the molecule in the image: i) indicate how many stereogenic centres there are and if the molecule is overall chiral or not ii) assign the appropriate stereodescriptors to the molecules
- When 0.075g of penicillamine is dissolved in 10.0 mL of pyridine and placed in a sample cell 10.0 cm in length, the observed rotation at 20 degrees (using the D line of sodium) is -0.47 degrees. Calculate the specific rotation of penicillamine. a. (-0.47)/[(0.075g/mL) (1.00 dm)]= -6.3 b. (0.47)/[(0.075g/mL) (1.00 dm)]= 6.3 c. (-0.47)/[(0.0075g/mL) (1.00 dm)]= -63 d. (0.47)/[(0.0075g/mL) (1.00 dm)]= 63To the right are two enantiomeric natural products with vastly different olfactory properties. I find this example of enantiomeric pairs particularly intriguing, as I love caraway and rye but loathe searment: Answer the questions below with the understanding that an optically pure solution of the (-)-enantiomer of carvone rotates light counterclockwise 60*. a. what would be the observed optical rotation of a solution comprised of a 3:1 ratio of the (+) to (-) enantiomers of carvone? b. a different solution of both carvone enantiomers exhibits an observed optical rotation of -10*. determine the enantiomeric excess for this solution. c. which enantiomer (R or S) is in excess in the solution from (b)? how do you know? d. using your answer (b) above, calculate the actual percentages of each enantiomer in the solution.(-)-Cholesterol has a specific rotation of -32o. A mixture of (+)- and (-)-cholesterol was analyzed by polarimetry, and the observed rotation was 14o. What is the percent composition of the (+) isomer in this mixture?Assume 1 g of sample was dissolved in 1 mL water and the sample cell was 1 dm long.