What does diastereomer mean?

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What does diastereomer mean?

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Answer 1 · 2016-07-31T10:54:29

Diastereomers are geometric isomers (typically a pair) that are not mirror images.

Explanation:

Cis and trans isomerism are clearly geometric isomers because they have the same connectivity, but are not mirror images. To resort to the well-worn example of $2-butylene$ $"2-butylene"$ , in BOTH cis and trans isomers, $C 1$ $C1$ connects to $C 2$ $C2$ ......connects to $C 4$ $C4$ . Nevertheless, their geometry is clearly distinguishable. For organic molecules that have 2 chiral centres, there are 2 pairs of enantiomers, $R, R$ $R,R$ and $S, S$ $S, S$ , and $R, S$ $R,S$ , and $S, R$ $S,R$ . Sometimes, $S, R$ $S, R$ is equivalent to $R, S$ $R, S$ . Nevertheless $R, S$ $R,S$ shares a diastereomeric relationship with $R, R$ $R,R$ and $S, S$ $S,S$ , the enantiomers.

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What does diastereomer mean?

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