How do E and Z isomers arise in molecules?

1 Answer
anor277
Dec 13, 2016

Structural isomerism derives from different connectivity for a given formula.

Explanation:

Geometric isomerism presumes the SAME structural isomerism, i.e. the same connectivity, however different geometry for the same structure. Organic chemistry provides rich examples of structural and geometric isomerism, and E,Z or cis/trans isomerism provides many instances.

Consider 2-butylene, H3C−CH=CH−CH3; this is a simple organic structure that can nevertheless generate 2 geometric isomers as shown.

See here

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For both isomers, connectivity IS THE SAME. C1 connects to C2 to C3 to C4. Nevertheless, because of the different geometry, the isomeric butenes have different structures, and chemical properties.

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