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Unformatted text preview: Weekly Quiz April 14, 2006 1. Draw all the stereoisomers for the given molecule. Show all the interrelationships between stereoisomers. Br Br CH 3 CH 3 H Br H CH 3 H Br CH 3 CH 3 Br H H CH 3 Br H CH 3 CH 3 H Br H CH 3 Br H CH 3 CH 3 Br H H CH 3 H Br Br Br * * only 2 assymetric carbons!!! 2 n gives the max number of stereoisomers Expect 4 stereoisomers! S R R S IDENTICAL!!!! MESO Achiral MESO Achiral R R S S Stereoisomer A Stereoisomer B Stereoisomer C Stereoisomer D Relationship between A and B--they are identical compounds Relationship between C and D--they are enantiomers Relationshiop between A and C--they are diastereomers Relationship between A and D--they are diastereomers A and B are not chiral and not optically active. C and D are chiral and optically active. An equal mixture of C and D will not show optical activity. This is a racemic mixture. This does not mean the compounds are not optically active. When you mix them in equal ratios half the sample rotates plane-polarized light in one direction and the other half rotates plane-polarized light in the...
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