For the structure of (S) lactic acid it has a specific rotation +3.8. a) If the% e.e of a lactic acid solution is 70%, what is the [α] for this solution? (b) How many dextrorotatory and left-handed isomers does the solution contain?
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For the structure of (S) lactic acid it has a specific rotation +3.8.
a) If the% e.e of a lactic acid solution is 70%, what is the [α] for this solution?
(b) How many dextrorotatory and left-handed isomers does the solution contain?
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- (S)-Lactic acid has a specic rotation of +3.8. (a) If the ee of a solution of lactic acid is 60%, what is [a] for this solution? (b) How much of the dextrorotatory and levorotatory isomers does the solution contain?(-)-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.What is the enantiomeric excess (ee) of a sample of mendalic acid with a specific rotation of +50, when pure (R)-mendelicacid has a specific rotation of -154. What is the composition of the sample in R and S isomers?
- After an attempt to resolve a racemate into its entantiomers, 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 compund?the observed rotation, α, of a 59.9 mg mL-1 solution of an optically-active substance in a 20 cm path length polarimeter was +3.7°. Calculate the value of the specific rotation, [α], in degrees to one decimal place.To 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.
- If the optical rotation of a pure enantiomer A is +10 and the optical rotation of a mixture of two enantiomers (A+B) is -4 (Negative 6), what is the percentage of A and B in that mixture?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?Consider a solution made up of 90% R and 10% S. What is the enantiomeric excess (ee%) of the R enantiomer?
- Draw a diastereomer of the atatched structure. Identify the steroecneters with an astrick and all chirality centers must be in the R orientation. Assign priotiy numbers at each chirality center.Compound W shows stereoisomerism. Why are such isomers formed in approximately equimolar quantities no matter the synthetic pathway used for the preparation of the compound?A mixture of the stereoisomers of glutamic acid has an observed rotation of +6°. The specific rotation of pure (R)-(–)-glutamic acid is –24°. Calculate (a) the enantiomeric excess, (b) the composition of the mixture, and (c) draw the 3D structure of the excess glutamic acid.