11. (R)-2-bromooctane has a specific rotation of -34.25° and (S)-2-octanol has a specific fola +9.90*. If...
(s)-7-chbrobota 3. (2 points) Consider that (S)-2-Chlorobutane has a specific rotation of +13.1 and (R)-2-Chlorobutane has a specific rotation of -13.1 °. Which isomer is dominant and what is the optical purity of the mixture of (R) and (S)-2- Chlorobutane, whose specific rotation was found to be -2.5°. What is the percent composition of the mixture? ile there iture La
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...
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...
20. The specific rotation of (S)-alanine is +8.5°. If a mixture of alanine enantiomers is 80% S and 20% R, what is the specific rotation of mixture? A) +14.17 B) -14.17 C) +10.62 D) +42.5
3.34 The specific rotation of (S)-carvone (at +20°C) is +61. A chemist prepared a mixture of (R)- OF (R)- carvone and its enantiomer, and this mixture had an observed rotation of -55°. (a) What is the specific rotation of (R)-carvone at 20°C? (b) Calculate the % ee of this mixture. (c) What percentage of the mixture is (S)-carvone?
5.54 The specific rotation of (S)-carvone (at +20°C) is +61. A chemist prepared a mixture of (R)- carvone and its enantiomer, and this mixture had an observed rotation of -55°. (a) What is the specific rotation of (R)-carvone at 20°C? (b) Calculate the % ee of this mixture. (c) What percentage of the mixture is (S)-carvone?
need help with 15-17 For Problems 15-17, consider (R)-carvone (below), -61. which has a specific rotation of [a] o CH3 (t 4)S H2C CH3 15. What is the % ee of a sample of carvone that exhibits a specific rotation of -40? (1 pt) 16. What is the specific rotation of a sample of carvone that contains a 50/50 mixture of the R and S enantiomers? (1 pt) 17. If a sample of carvone gives a specific rotation of +48,...
Assume that optically pure (S)-2-iodononane has a specific rotation of + 9.5o (clockwise rotation of the plane-polarized light). Claculate the percentage of (S) enantiomer required when the specific rotation for a mixture of 2-iodononane enantiomers will be -2.1o (counterclockwise rotation of the plane-polarized light).
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
the R-(+) enantiomer of a certain compound has a specific rotation of +52. A mixture of this compound with its enantiomer has a has an observed rotation of -26. what is the %ee of this sample and which enantiomer is in excess? what is the ration of R:S in this mixture?