Stereoisomerism
AQA A-Level Chemistry
3.3.1
Compounds can have the same molecular formula and connectivity while still existing in different arrangements in three-dimensional space. Building on our understanding of structural isomerism, we can now explore stereoisomerism and, in particular, how restricted rotation around carbon–carbon double bonds gives rise to E/Z isomers. This leads naturally to the CIP priority rules, which provide a systematic way to identify and name these stereoisomers.
In this topic you will:
- Know and understand the meaning of the terms stereoisomer and geometric (E/Z) isomer.
- Understand why restricted rotation about carbon–carbon double bonds gives rise to E/Z isomerism.
- Be able to identify when a molecule can display E/Z isomerism.
- Be able to identify, draw and name simple E and Z isomers.
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