FINAL PANIC TIME

E1 and E2

Introduction and the Key Pattern

Elimination Reactions Often Accompany Substitution Reactions

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alkenes to alkyl halides: what bonds form and break?

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Elimination Reactions: The Key Bond Forming/Breaking Pattern

note the key pattern: in each case we’re forming a new c-c pi bond and breaking two single bonds to carbon

This is completely different that acid base/ substitution reactions because it involves two adjacent carbons. This is an acid-base reaction, so one componnet of the elimination reaction will involve a strong base

We also break a bond between carbon and a leaving group. Remember that the best leaving groups are weak bases.

The new information is that were are forming a c-c pi bond in addition to what has been stated above about the mechanism.

reactants: substrate + base

Product: major product, conjugate acid, and leaving group

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The E1 Reaction

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First look at the bonds that are being formed and broken

The rate of the E1 mechanism only depends on the concentration of the substrate(not base)

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The rate is fastest for tertiary substrates

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E2 Mechanism

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The rate depends on concentration of both substrate and base

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stereochem:

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