Organic Chemistry

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8. Elimination Reactions

E2 - Anti-Coplanar Requirement

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Now we know how to find β-hydrogens, but it turns out that E2 reactions require an anti-coplanar arrangement (also called anti-periplanar) in order for the orbitals to overlap and create a new pi bond.

 

On a cyclohexane chair, the leaving group and β-hydrogen must be DIAXIAL to each other in order to fulfill the anti-coplanar requirement. 

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The Anti-Coplanar Requirement

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Identify the completion of E2 mechanisms

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Identify the completion of E2 mechanisms

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Identify the completion of E2 mechanisms

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Identify the completion of E2 mechanisms

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