Stereoisomers optical isomers part 2
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Stereoisomers: Optical Isomers PART 2. CH21 Problem Solving Class. Sample Problem. Sample Problem. S. R. S. S. enantiomers. same. S. S. R. R. same. same. Review Problem. Review Problem. Diastereomers. Diastereomers. Sample Problem.

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Stereoisomers optical isomers part 2

Stereoisomers: Optical IsomersPART 2

CH21 Problem Solving Class



Sample problem1
Sample Problem

S

R

S

S

enantiomers

same

S

S

R

R

same

same







Epimers special diastereomers different with one chiral center
Epimers: Special Diastereomers, different with ONE chiral center



Meso compounds
Meso Compounds


Meso compounds1
Meso Compounds


Meso compounds2
Meso Compounds


Meso compounds3
Meso Compounds







Stereochem of reactions
Stereochem of Reactions


Stereochem of reactions1
Stereochem of Reactions




Sample problem8
Sample Problem

  • Equal chance to attack both carbons from the top, vs. both carbons from the bottom, which means you’ll have 2 racemic pairs (50:50)

  • BUT THEN THESE RACEMIC MIXTURES aren’t 50:50 because of the methyl group in the ‘up’ position… meaning it won’t be a 25:25:25:25 mixture of all for, but a A:A:B:B ratio



Prochirality1
Prochirality

  • Using our RIGHT HAND RULE, try to see if you can get a 1-2-3 with your right hand. The face where your thumb points to is the Re face!

  • Then with your left land, find 1-2-3, and you’ll find the Si face.


Prochirality2
Prochirality

  • Using our RIGHT HAND RULE, try to see if you can get a 1-2-3 with your right hand. The face where your thumb points to is the Re face!

  • Then with your left land, find 1-2-3, and you’ll find the Si face.











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