The specific rotation of compound X is +10.2°. A mixture of compound X and its enantiomer are placed in the polarimeter and the observed rotation is +2.3°. Find the enantiomeric excess and determine which enantiomer is in excess (+ or -).
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- An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +16.0°. If it is known that the specific rotation of the R enantiomer is -33.3°, determine the percentage of each isomer in the mixture. R enantiomer: S enantiomer: % %Macmillan Learning An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +12.8°. If it is known that the specific rotation of the R enantiomer is -29.5°, determine the percentage of each isomer in the mixture. R enantiomer: S enantiomer: % %The anti-inflammatory agent, (S)-naproxen sodium salt has a specific rotation of +66°. The commercial preparation of the latter agent results in a mixture that has a 97% enantiomeric excess (ee). coj H3CO Na (S)-naproxen sodium salt (a) Draw the R enantiomer of naproxen sodium salt. (b) What effect does the R enantiomer have on plane-polarized light? (c) What is the observed specific rotation of anti-inflammatory agent mixture? (d) What percentage of each enantiomer is obtained from the above commercial mixture? (e) Provide a reaction scheme for the formation of the (S)-naproxen sodium salt from "acidic" (S)-naproxen.
- Glutamic acid is a naturally occurring amino acid and isthe precursor to the food additive MSG (monosodium glutamate)which can cause allergic reactions in some people. If naturally occurring L glutamic acid has a melting point of 205 C and an optical rotation of + 31.5, what is the melting point and optical rotation of its enantiomer?A solution prepared by mixing 10 mL of a 0.10 M solution of the R enantiomer of a compound and 30 mL of a 0.10 M solution of the S enantiomer was found to have an observed specific rotation of +4.8. What isthe specific rotation of each of the enantiomers? (Hint: mL * M = millimole, abbreviated as mmol)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.
- Glutamic acid is a naturally occurring amino acid and is the precursor to the food additive MSG (monosodium glutamate) which can cause allergic reactions in some people. If naturally occurring L glutamic acid has a melting point of 205 C and an optical rotation of + 31.5, what is the melting point and optical rotation of its enantiomer?The specific rotation of the S-enantiomer of a compound is -120°. What is the percentage of the R-enantiomer in a sample of the compound that has a measured specific rotation of –30°.b) A synthetic sample of MSG (conc 0.350 g/mL) is found to be a mixture of two enantiomers. What is the percentage of each enantiomer in the sample if the experimental rotation of the sample is found to be -2.15°?
- If a pure R isomer has a specific rotation of –126.0°, and a sample contains 70.0% of the R isomer and 30.0% of its enantiomer, what is the observed specific rotation of the mixture? [a] =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. 17cis-Dimethylcyclobutane has two planes of symmetry. Draw the compounds and identify both planes of symmetry. Is cis-Dimethylcyclobutane optically active?