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question 4.

question 4.

Chemistry
Chemistry
10th Edition
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Chemistry 240, Organic Chemistry 1 R, S stereoisomers: Rules for assigning R, S stereochemistry 1. Build the following molecule using your model kit. Prioritize the 4 atoms bonded to chirality center. CH3 Br H3CH2C H. 2. Practice redrawing the molecule such that the lowest priority group points towards the BACK. Determine whether this stereoisomer is R or S. 3. Repeat 1 and 2 with the following molecule: CH3 H2N H. 4. Assign R and S stereochemistry to the chirality centers in the following molecules: Br H CH3 CH3 5. Instead of redrawing a molecule to make the lowest priority group point towards the BACK, there is a trick you can use to determine R, S stereochemistry: a. Prioritize the four groups present b. Switch the lowest priority group with the group pointing back. By switching the two groups you've made the other enantiomer. Prove this to yourself! Once lowest priority group is pointing back, determine the stereochemistry. The original molecule has the stereochemistry that is the opposite of what you've just determined! C. Try trick from # 5 with the following molecule: H CH3
Transcribed Image Text:Chemistry 240, Organic Chemistry 1 R, S stereoisomers: Rules for assigning R, S stereochemistry 1. Build the following molecule using your model kit. Prioritize the 4 atoms bonded to chirality center. CH3 Br H3CH2C H. 2. Practice redrawing the molecule such that the lowest priority group points towards the BACK. Determine whether this stereoisomer is R or S. 3. Repeat 1 and 2 with the following molecule: CH3 H2N H. 4. Assign R and S stereochemistry to the chirality centers in the following molecules: Br H CH3 CH3 5. Instead of redrawing a molecule to make the lowest priority group point towards the BACK, there is a trick you can use to determine R, S stereochemistry: a. Prioritize the four groups present b. Switch the lowest priority group with the group pointing back. By switching the two groups you've made the other enantiomer. Prove this to yourself! Once lowest priority group is pointing back, determine the stereochemistry. The original molecule has the stereochemistry that is the opposite of what you've just determined! C. Try trick from # 5 with the following molecule: H CH3
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