Swapping two groups but only two groups will give the

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Swapping two groups (but only two groups) will give the opposite enatiomer. Sometimes it is easier to draw the R enantiomer and convert to S. Naming Enantiomers (S) (R)
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R and S Versus (+) and (–) Some R enantiomers are ( + ) and some are ( ). Some S enantiomers are ( + ) and some are ( ).
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Compounds with Two Asymmetric Centers maximum # of stereoisomers = 2 n ( n = # of asymmetric centers) 1 and 2 are enantiomers. 3 and 4 are enantiomers.
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Diastereomers 1 and 2 are enantiomers. 3 and 4 are enantiomers. Diastereomers are stereoisomers that are not enantiomers. 1 and 3 are diastereomers. 1 and 4 are diastereomers. 2 and 3 are diastereomers. 2 and 4 are diastereomers. Diastereomers have different physical and chemical properties.
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Chirality in Rings
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Two Asymmetric Centers, Four Stereoisomers The cis stereoisomers are a pair of enantiomers . The trans stereoisomers are a pair of enantiomers .
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Identifying an Asymmetric Center An asymmetric center is attached to four different groups. two asymmetric centers, four stereoisomers
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There are only two stereoisomers: cis and trans. No Asymmetric Centers
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Two Asymmetric Centers: Three Stereoisomers (a meso compound and a pair of enantiomers for symmetrically substituted compounds)
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A Meso Compound Has a Superimposable Mirror Image Meso compounds are optically inactive even though they have asymmetric centers.
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A Meso Compound Has a Plane of Symmetry
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