stereochemashwin - Stereochemistry O H H Step 1 How many...

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Stereochemistry Step 1 . How many stereocenters does the molecule have? 1. Is the atom tetrahedral? 2. Are all four groups around it different (atoms, groups of atoms, lone pairs)? Repeat for every possible stereocenter. Step 2 . Are the stereocenters R or S? 1. What are the priorities of the groups around the stereocenter? Go by atomic number of the atoms bonded directly to the stereocenter. If two or more tie, go the the atoms bonded to those atoms and compare them, etc. For double bonds you can count that atom twice. 2. Looking down the bond from the stereocenter to its lowest priority group, do the higher priority groups go clockwise (R) from 1 to 3 or counterclockwise (S)? Repeat for every stereocenter. Step 3 . How many stereoisomers does it have? 1. How many stereocenters does it have? 2 n 2. Is the molecule or any of its diastereomers a meso compound? 3. Does it have an internal plane of symmetry? Subtract one for every meso compound.
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This note was uploaded on 05/08/2009 for the course CHEM 215 taught by Professor Gottfried during the Fall '08 term at University of Michigan-Dearborn.

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stereochemashwin - Stereochemistry O H H Step 1 How many...

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