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Specific rotation Specific rotation can be used to examine samples of chiral compounds. The following problems are typical calculations and determinations that organic chemists do. Task 1. Specific rotation of enantiopure (R)-carvone is –60°. An unknown sample of carvone shows specific rotation of +42°. What is the ratio of enantiomers in the sample? What is enantiomeric excess of the mixture? Show how you arrived at the answer. 2. Calculate the observed rotation of a solution of 0.5245g of (S)-1-amino-1-phenylethane diluted to a volume of 10.0 mL with methanol at 20 °C, using the D line of a sodium lamp and a 1.00 dm tube. Specific rotation of this material: [a]p = -30.0° 3. Draw the structure of (S)-1-amino-1-phenylethane

Specific rotation Specific rotation can be used to examine samples of chiral compounds. The following problems are typical calculations and determinations that organic chemists do. Task 1. Specific rotation of enantiopure (R)-carvone is –60°. An unknown sample of carvone shows specific rotation of +42°. What is the ratio of enantiomers in the sample? What is enantiomeric excess of the mixture? Show how you arrived at the answer. 2. Calculate the observed rotation of a solution of 0.5245g of (S)-1-amino-1-phenylethane diluted to a volume of 10.0 mL with methanol at 20 °C, using the D line of a sodium lamp and a 1.00 dm tube. Specific rotation of this material: [a]p = -30.0° 3. Draw the structure of (S)-1-amino-1-phenylethane

Chemistry
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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**Specific Rotation** Specific rotation can be used to examine samples of chiral compounds. The following problems are typical calculations and determinations that organic chemists do. **Task** 1. Specific rotation of enantiopure (R)-carvone is −60°. An unknown sample of carvone shows specific rotation of +42°. What is the ratio of enantiomers in the sample? What is enantiomeric excess of the mixture? Show how you arrived at the answer. 2. Calculate the observed rotation of a solution of 0.5245g of (S)-1-amino-1-phenylethane diluted to a volume of 10.0 mL with methanol at 20 °C, using the D line of a sodium lamp and a 1.00 dm tube. Specific rotation of this material: [α]_D = −30.0° 3. Draw the structure of (S)-1-amino-1-phenylethane.
Transcribed Image Text:**Specific Rotation** Specific rotation can be used to examine samples of chiral compounds. The following problems are typical calculations and determinations that organic chemists do. **Task** 1. Specific rotation of enantiopure (R)-carvone is −60°. An unknown sample of carvone shows specific rotation of +42°. What is the ratio of enantiomers in the sample? What is enantiomeric excess of the mixture? Show how you arrived at the answer. 2. Calculate the observed rotation of a solution of 0.5245g of (S)-1-amino-1-phenylethane diluted to a volume of 10.0 mL with methanol at 20 °C, using the D line of a sodium lamp and a 1.00 dm tube. Specific rotation of this material: [α]_D = −30.0° 3. Draw the structure of (S)-1-amino-1-phenylethane.
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