Class 12 Chemistry Haloalkanes and Haloarenes Conditions of E1 reaction

Conditions of E1 reaction:

The factors that favors SN1 reaction also favors E1 reaction which are as follows:

Alkyl halide:

E1 reaction occurs faster if the carbocation intermediate is more stable and has a lower activation barrier.

3̊ carbocation > 2̊ carbocation > 1̊ carbocation.

Leaving group:

The leaving group with a full negative charge is always expelled out. As a result the best leaving groups are those that can best stabilize an anion. In this reaction, it will not be odd to consider water as a leaving group.

Solvent:

When a carbocation undergoes solvation it allows the carbocation to get surrounded by more electron density thereby making the +ve charge more stable. The solvent can be protic or Aprotic but it must be polar. 

 

Nucleophiles:

Those nucleophiles that undergo E1 mechanism are weak neutral molecules. Any nucleophiles stronger than this is also a strong base that results in elimination reactions.  

Like the E2 reaction, the E1 favors the Zaitsev product (always).

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