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Chapter 5 notes - Chapter 5 Stereochemistry Isomerism There...

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Chapter 5: Stereochemistry Isomerism: There are two main types of isomerism, stereo and constitutional. Constitutional: Same molecular formula, but connectivity of the atoms is different. Stereoisomers: Same molecular formula and same connectivity, but the orientation in space is different. Assigning Stereochemistry. RIS Via Cahn-Ingold-Prelog rules, E/Z, and cis/trans. R vs. S - Applies to chiral carbons, rank substituents by atomic number. The 4 th substituents should be bent out of the plane t If the molecules priorities are clockwise, assign R, if a-W 4-cfl% yCv counterclockwise, assign S. If there is a tie, move on to the next atom in the chain and label its substituents. E vs Z - Applies to alkenes. Like C-I-P rules, assign priorities by atomic number. E denotes priorities on opposing sides. Z denotes priorities on same side. Cis Vs. Trans- Applies to alkenes AND rings. For an alkene, cis means the same groups are on the same side. Trans means the same groups are on opposing sides.
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