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Week 4 Chapter 3 Chem 30A Answers

Week 4 Chapter 3 Chem 30A Answers - Chemistry 30A Week 4...

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Chemistry 30A Week 4 Covel Tutorials Objectives: 1. Understand and identify stereoisomers and chiral centers 2. Learn R,S nomenclature 3. Distinguish between enantiomers, diastereomers and meso compounds R,S Nomenclature: Important Steps: 1. Assign priority to four substituent groups based on atomic number 2. Double bonds count as two single bonds 3. Orient priority number 4 away from you to determine R (clockwise) or S (counterclockwise) Determine if the indicated chiral center is R or S: From left to right: R, R From left to right: R, S Name the following molecules, indicating R,S configurations: (3S,4S)-3-methyl-4-(1-methylethyl)-heptane (3R,4R)-4-ethyl-3,4-dimethylheptane
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Chirality: Enantiomers Non-superimposable mirror images. All chiral centers of enantiomers have switched configurations (ie, S,S to R,R or S,R to R,S, etc.) Diastereomers Stereoisomers that are not mirror images (2 or more chiral centers) One or more of the chiral centers have switched configurations (ie S,R to S,S or S,R to R,R)
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