The absolute value of the specific rotation of an enantiomer 2-butanol is 13.5o. What is the percentage of each enantiomer (R and S) in a mixture that has a specific rotation of -8.5o? The (R)-enantiomer is levorotatory. Be clear and detailed.
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- The absolute value of the specific rotation of an enantiomer 2-butanol is 13.5o. What is the percentage of each enantiomer (R and S) in a mixture that has a specific rotation of -8.5o? The (R)-enantiomer is levorotatory. Be clear and detailed.
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- The pure D-form of a compound has a specific rotation (D line of sodium, 20° C) of +24°, whereas the pure L- form of the compound has a specific rotation (D line of sodium, 20° C) of -24°. If a scientist has a sample of this compound that is known to be 78% pure D-form (and, therefore, 100% - 78% pure L-form), what will be the observed rotation of this sample? Enter your answer to the nearest hundredth. The units are assumed to be degrees. 13.44b) 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°?When 1 g of compound X is dissolved in 100 mL of solvent, the observed rotation is +12. What will be the observed rotation if 1 g of compound X is dissolved in 200 mL of solvent?
- (−)-Menthol is the most stable stereoisomer of 2-isopropyl-5-methylcyclohexanol and has the R configuration at the hydroxyl-substituted carbon. (a) Draw the preferred conformation of (−)-menthol. (b) (+)-Isomenthol has the same constitution as (−)-menthol. The configurations at C-1 and C-2 of (+)-isomenthol are the opposite of the corresponding chirality centers of (−)-menthol. Write the preferred conformation of (+)-isomenthol.Specific rotation, [a]p of (S)-2-butanol at 25°C is +13,52°. Enantiomeric excess (%ees) of a mixture of (R)-2-butanol and (S)-2-butanol having specific rotation of + 6.76° at 25°C is Select one: O A. 60% O B. 50% O C. 20% O D. 75%One commercial synthesis of flurbiprofen (the active ingredient in Ansaid and a score of other over-the-counter and prescription nonsteroidal anti-inflammatory drug preparations) gives the enantiomer shown in 94% enantiomeric excess. H CH3 он (a) Assign an R or S configuration to this enantiomer of flurbiprofen. OR What are the percentages of R and S enantiomers in the mixture? (Enter unrounded values.) (b) R: % S: 96
- 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: % %• Consider the following compounds. Assign the R or S configuration to each stereogenic center (add answers onto structures): CH,CH, OCH3 CH3 CH,CH3 сно H;CO,C NH2 co,H 18 Assign the absolute configuration at the stereogenic centre C3 of compound Y. OH Compound Y Assign the absolute configuration at the stereogenic centre C2 of compound Y. Br HO 1 CF3 bund Y Assign the absolute configuration at the stereogenic centre(s) C2 abd C3 of compound Y. HO, HO, 20 Compound Y רAssign R or S configurations to each stereogenic center of isoborneol and borneol. Give the relationship between these two stereoisomers.
- A sample mixture containing the made-up enantiomers (R)-(+)-Nenamide and (S)-(-)-Nenamide has an apparent specific rotation of +6.50° at 25 °C. This sample has an enantiomeric excess (EE) of 43.0%. Provide answers to the following questions : 1.Which enantiomer is in excess in the sample? 2.What is the specific rotation of (S)-(-)-Nenamide?A pure sample of the R isomer of a particular compound is known to have a specific rotation of -40. A mixture of the two enantiomers of the compound gives a specific rotation of +8. What are the percentages of the S and R enantiomers in the mixture?Coibacin B (shown below) is a natural product that exhibits potent anti-inflammatory activity and potential activity in the treatment of leishmaniasis, a disease caused by certain parasites (Org. Lett. 2012, 14, 3878-3881): (a) Assign the configuration (R or S) of each chirality center (labeled A to C) in coibacin B. (b) Identify the number of possible stereoisomers for this compound, assuming that the geometry of the alkenes are fixed. Choices are given below and write the CAPITAL LETTER of your choice. A. 2 В. 4 С. 8 D. 16 ANSWERS: (a) A. В. C. (b)