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How do you name optical isomers?

Answer 1

A long story.....

First you have to identify the chiral centres...represent them geometrically, AND then assign the chiral centres with respect to #R#, and #S# geometries...

Refer to these sources for the geometry assignment and discussion on how to separate enantiomers: here and here.

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Answer 2

Elias Aguila

Optical isomers are named using the Cahn-Ingold-Prelog priority rules. Assign priorities to substituents based on atomic number. If the highest priority groups on each chiral carbon are arranged in a clockwise direction, it's labeled as R; counterclockwise, it's labeled as S. The pair of isomers is then designated as the R,R or S,S enantiomer and the R,S or S,R diastereomer.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.