Microsoft PowerPoint - 12B

Microsoft PowerPoint - 12B - Indicate each letter that...

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Unformatted text preview: Indicate each letter that marks a chiral center. b , d , f f , k , m , c , d , f f , k , m , k , m , k , m l l b u t a t a & c , b & c 1% 2% 3% 7% 3% 12% 3% 64% 6% 4pts 3pts 2pts a b c d f h g m k 3pts 1pt 2pts 1. a, b, d, f 2. a, d, f, k, m 3. b, c, d, f 4. b, d, f, k, m 5. d, g, h, k, m 6. b, d, g, h, k, m 7. All but a 8. All but a & c 9. All but a, b & c * * * * * * meso compound (chiral centers, but not chiral) Summary of Critical Points from Last Class C H Br I Cl H C I Cl Br Chiral center = atom with four different groups attached * * * * a group = any atom or combo of atoms (e.g., H, OH, CH 3 , CO 2 H, or anything) each chiral center has two possible configurations Mirror images but not the same = Enantiomers Summary of Critical Points from Last Class Chiral center on a ring? * To determine if a molecule as a whole is chiral, look for an internal symmetry plane Not chiral Chiral (no internal symmetry plane) Summary of Critical Points from Last Class Chiral molecules with no chiral centers (very rare, but do occur) Cl C C C CH 3 H H H 3 C CH 3 H Cl H 3 C H external mirror plane C C C H 3 C H H CH 3 external mirror plane Molecules with two chiral centers that are not chiral ( meso componds ) * * * * Internal mirror plane Internal mirror plane Not chiral Not chiral Preview of this Class X Y X and Y are both trans Same molecular formula But not the same Configurational Stereoisomers (more specifically, they are enantiomers) Today: Learn how to describe the difference between X and Y Also learn a new term for the relationship between X and Z X Z but not identical To do this, we will designate chiral centers as either RIGHT HANDED (R) , S S R or LEFT HANDED (S for sinister ) Same atom connectivity R Begin Work on ChemActivity 12B Clicker question(s) covering through CTQ 28 in ~8 minutes Which terms best describe the following relationships? B & C; D & E; A & B 0% 0% 0% 0% 0% 3% 2% 93% 0% 2% CH 3 CH 3 H 3 C H 3 C H 3 C H 3 C A B C D E 1. Conformers, Conformers, Conformers 2. Conformers, Conformers, Enantiomers 3. Conformers, Enantiomers, Enantiomers 4. Enantiomers, Enantiomers, Enantiomers 5. Diasteriomers, Conformers, Enantiomers 6. Diasteriomers, Diasteriomers, Conformers 7. Diasteriomers, Diasteriomers, Enantiomers 8. Diasteriomers, Diasteriomers, Diasteriomers 9. Not sure 10. Need more time 0. Hand Models...
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This note was uploaded on 07/29/2009 for the course ENGL engl 500 taught by Professor Reter during the Spring '09 term at University of Washington.

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Microsoft PowerPoint - 12B - Indicate each letter that...

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