If the literature value of specific rotation for a chiral compound is -53.6°, what is the enantiomeric excess of a compound with a measured specific rotation of -40.5°?
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- A 0.26 M solution of an enantiomerically pure chiral compound D has an observed rotation of +0.197° in a 1‑dm sample container. The molar mass of the compound is 132.3 g/mol. a. What is the specific rotation of D? b. What is the observed rotation if this solution is mixed with an equal volume of a solution that is 0.26 M in L, the enantiomer of D? c. What is the observed rotation if the solution of D is diluted with an equal volume of solvent?The specific rotation of optically pure adrenaline in water at 25°C is -53. If a chemist has a sample of synthetic adrenaline with a specific rotation of -45, calculate the enantiomeric excess.Q9 Account for the change in the observed optical rotation of your carvone samples with an increase in concentration of carvone. ☐ At lower concentrations, an increase in the number of ethanol molecules in the sample interferes with the optical rotation reading. ☐ The observed optical rotation of the carvone samples is independent of concentration. ☐ An increase in the number of chiral molecules results in a cumulative effect on the optical rotation.
- Consider the structure of the molecule below The absolute configuration (R/S) of the chiral carbon with chlorine is The enantiomer of this structure is (draw it to the right): Draw a constitutional isomer of the molecule (draw it to the right):Draw all possible stereoisomers for the following molecule. Indicate which are enantiomers and which are diastereomers and assign absolute chirality at all centers and for all structures. H2NSucrose is a chiral compound, and enantio-pure sucrose has specific rotation [?]? 20 = +66.5°. A sample of synthesized sucrose from the organic chemistry lab was tested, and the specific rotation of the sample is [?]? 20 = +60.1°. a) Determine the enantiomeric excess (ee) of the sample b) Calculate the ratio of two enantiomers c) Draw the structure of the minor enantiomer in the sample
- A limited number of chiral compounds having no stereogenic centers exist. For example, although A is achiral, constitutional isomer B is chiral. Make models and explain this observation. Compounds containing two double bonds that share a single carbon atom are called allenes. Locate the allene in the antibiotic mycomycin and decide whether mycomycin is chiral or achiral.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)Which statement is correct about stereoisomers A, B, and C? H- CI CH3 S S CH3 A CI -H CI H A and B are enantiomers, C is a meso compound. A and C are enantiomers, B is a meso compound. A, B, and C are all meso compounds. Band C are enantiomers, A is a meso compound. CH3 R R CH3 B -H - CI H- H CH3 S R CH3 C CI -CI
- 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°.A chiral sample gives a rotation that is close to 180°. How can one tell whether this rotation is +180° or -180°?5. Two stereoismers with two chiral stereogenic centers that are not mirror images are:
