8A_worksheet6 - other. 6) A _____________________ mixture...

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Chem 8A, Spring 2010 Worksheet 6 Concepts: chirality optically active stereoisomers asymmetric carbon enantiomer diastereomer racemic chiral catalyst enzymes Practice Problems: 1) For each of the following molecules, there are no dashes or wedges indicated. Decide if the molecule is chiral. How many asymmetric carbon centers does each molecule have? 2) For these chiral molecules, circle each asymmetric carbon center. (Note: Ac is an abbreviation for an acetyl group, and this does not contain any asymmetric carbon centers)
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3) Indicate the two types of stereoisomers and give an example of a molecule for each. 4) Assign R or S configuration. 5) _______________________ are stereoisomers that are non-superimposable mirror images of each
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Unformatted text preview: other. 6) A _____________________ mixture contains exactly 50% of each R and S isomer. 7) Explain why an enzyme can be considered a chiral catalyst? 8) Name the following: 9) Draw (R)-alanine (the unnatural D-amino acid): 10) Now draw both enantiomers of methamphetamine. 11) Draw the racemic mixture (both enantiomers) that result upon hydrogenation of the following alkene with an achiral catalyst. 12) Indicate for the following pairs of compounds whether they are identical, constitutional isomers, or enantiomers. CH 2 CO 2 H H 3 C achiral Rh catalyst H 2 Br Cl H 3 C Br Cl H 3 C a) b) c) d) HO OH Cl Cl HO OH Cl Cl N CH 3 H Cl N H 3 C H Cl H 3 C OH NH 2 CH 3 HO NH 2...
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This note was uploaded on 06/27/2010 for the course CHE CHE 8A taught by Professor David during the Spring '09 term at UC Davis.

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8A_worksheet6 - other. 6) A _____________________ mixture...

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