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Stereoisomers: Optical Isomers PART 2PowerPoint Presentation

Stereoisomers: Optical Isomers PART 2

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Stereoisomers: Optical Isomers PART 2

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Stereoisomers: Optical IsomersPART 2

CH21 Problem Solving Class

S

R

S

S

enantiomers

same

S

S

R

R

same

same

- 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

- 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.

- 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.