CEM143_2006_quiz_4_key

CEM143_2006_quiz_4_key - 4. (2 pts.) Draw the S isomer of...

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CEM 143 QUIZ 4 4 October 2006 Name ___________ ___ ___________________ Section _______ 1. (10 pts.) Identify the relationship for each pair of molecules, as enantiomers, rotational isomers (conformers), geometric isomers, constitutional isomers, identical, or none of the above. 2. (2 pts.) Identify the stereogenic center as either R or S . CH 3 H H CH 3 Br H Br CH 3 CH 2 CH 3 H 1 2 3 CH 3 H OH OH OH H OH H H 1a. 1b. H 3 C H OH OH H H 3 C CH 3 H HO HO H CH 3 Cl H Cl H H Cl H Cl 1c. 1d. 1e. O H OH constutional isomers - both are C 6 H 12 identical, with a plane of symmetry, not chiral constutional isomers - both are C 5 H 10 O conformers enantiomers - R,R and S,S 2,3-butanediol
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3. (2 pts.) Label the alkene as either cis, trans, E, or Z
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Unformatted text preview: 4. (2 pts.) Draw the S isomer of 2-bromobutane. 5. (2 pts.) What is the maximum number of stereoisomers possible for a ketohexose? An example of a ketohexose is fructose, shown below. 6. (2 pts.) Draw the Fischer projection for the compound shown below. CH 3 H Br CH 3 H Br H 3 C Br H CH 2 OH O H HO OH H OH H CH 2 OH fructose Number of stereogenic carbons = 3 Maximum number of stereoisomers = 2 3 = 8 Br CH 3 H 1 2 3 S CH 3 Cl H 1 1 2 2 highest priority groups on opposite side, therefore E...
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This note was uploaded on 07/25/2008 for the course CEM 143 taught by Professor Baker during the Spring '08 term at Michigan State University.

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CEM143_2006_quiz_4_key - 4. (2 pts.) Draw the S isomer of...

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