| cis-trans isomerism |
Compounds with double bonds, or alicyclic rings can exhibit isomerism, due to the attached groups lying above or below the plane of the oduble bond or ring. The "cis" compound is the one with the groups on the same side of the bond, and the "trans" has the groups on the opposite sides. The different isomers have different physical and chemical properties. Examples are fumaric acid/maleic acid and 1,3-dimethylcyclohexane - see below:
출처: www.ch.ic.ac.uk/vchemlib/mol/glossary/
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