(s)-7-chbrobota 3. (2 points) Consider that (S)-2-Chlorobutane has a specific rotation of +13.1 and (R)-2-Chlorobutane has...
Part of a stereochemistry and polarimetry lab 3. (4pts) (S)-2-bromobutane has a reported specific rotation of 23.1° and (R)-2-bromobutane has areported specific rotation of -23.1°C. A given sample had a measured specific rotation of -9.1°. a) Which isomer of 2-bromobutane is dominant? b) What is its percent enantiomeric excess (%ee)? 4. (4pts) A carbon atom is said to be stereogenic if it is bonded to four different groups. Identify the stereogenic carbons in the following compound. Circle all the stereogenic...
9. Specific rotation of enantiopure (R)-malic acid is -6. An unknown sample was found to have a specific rotation of -2 Which isomer is the major component in the unknown mixture? HO OH Malic Acid O OH Circle one: R S What is the enantiomeric excess of the mixture? Show your calculations. 9. Specific rotation of enantiopure (R)-malic acid is -6. An unknown sample was found to have a specific rotation of -2 Which isomer is the major component in...
3. Pure Θ Kaylanoic acid has a specific rotation of-160° (same conditions and temperature as sample above). What is the % optical purity of the sample above ? (0.75 points) 4. 3.5 mg of optically-enriched(-) antibiotic Zachromycin was dissolved in 1.00 mL methanol in a 1.00 mL volumetric flask. The optical rotation was found to be -0.02220 in a 5.0 cm cell. What is the specific rotation? (0.75 points) 5. Calculate the enantiomeric excess and the specific rotation of a...
Consider a solution that contains 63.0% R isomer and 37.0% S isomer. If the observed specific rotation of the mixture is –59.0°, what is the specific rotation of the pure R isomer?
If a pure R isomer has a specific rotation of – 106.0°, and a sample contains 79.0% of the R isomer and 21.0% of its enantiomer, what is the observed specific rotation of the mixture? Number [a] = 10
If a pure R isomer has a specific rotation of –136.0°, and a sample contains 65.0% of the R isomer and 35.0% of its enantiomer, what is the observed specific rotation of the mixture?
if a pure R isomer has a specific rotation of -106.0, and a sample contains 70.0% of the R isomer and 30.0% of it's enantiomer, what is the observed specific rotation of the mixture
A sample of limonene has a specific rotation of +71.3 R-(+)-limonene [dD = + 125.6" and, S-(-)-limonene [a]D--1 22. 1 ®. What is the % ee? Number %ee What is the molecular composition of this same sample? Number s isomer = 1 % 1Somer Number R isomer-
11. (R)-2-bromooctane has a specific rotation of -34.25° and (S)-2-octanol has a specific fola +9.90*. If an 80/20 mixture of (R)-2-bromooctane and (S)-2-bromooctane undergoes DN HO", what will be the specific rotation of the product? Br ОН NaOH
- +13.52, and (R)-(-)-2-butanol, (a)" --13.52, with a measured specific rotation (a) = +6.76? What is the percent composition of a mixture of (S)-+)-2-butanol. [a] 67% (R), 339 (5) . 75%(R. 25 (5) 50% (R), 5006 (5) 3345R1.67% (5) e 25% (R), 754 (5)