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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

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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