pre8A2009lecture13

pre8A2009lecture13 - Lecture 13 Organic Chemistry Brief 8A...

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Unformatted text preview: Lecture 13 Organic Chemistry Brief 8A Isomers and Stereochemistry (Chap. 8) Chirality-An object that has a right-handed and left- handed form is said to be CHIRAL- A chiral object has a non-superimposable mirror image-eg. Right and left hand,-Chirality is often referred to as “handedness” Asymmetric Centers A tetrahedral carbon with 4 different substituents will be chiral A carbon atom in a molecule with four different substituents is considered an asymmetric center Seeing is believing…. Drawing enantiomers Identifying chiral centers--examples Specifying Configuration-- R, S Steps: 1) Rank groups attached to carbon of interest by atomic # #1 highest priority, #4 lowest 2) If first atom is the same, go to second atom 3) For multiple bonds, equivalent to same # of single bonds (these are called Cahn-Ingold-Prelog rules, same as used to designated priority in E, Z naming scheme) Specifying Configuration-- R, S Steps: 1) Rank groups attached to carbon of interest by atomic # #1 highest priority, #4 lowest 2) If first atom is the same, go to second atom 3) For multiple bonds, equivalent to same # of single bonds...
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This note was uploaded on 09/29/2010 for the course CHE 8A 55257 taught by Professor Neilshore during the Fall '10 term at UC Davis.

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pre8A2009lecture13 - Lecture 13 Organic Chemistry Brief 8A...

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