Video encyclopedia

Elimination reaction


E1 Reaction


E2 Reaction


Addition Reactions


Simply Mechanisms 12a. Elimination reaction 1 (bromoethane & ethanolic KOH)


Elimination Reactions

An elimination reaction is a type of organic reaction in which two substituents are removed from a molecule in either a one or two-step mechanism. The one-step mechanism is known as the E2 reaction, and the two-step mechanism is known as the E1 reaction. The numbers do not have to do with the number of steps in the mechanism, but rather the kinetics of the reaction, bimolecular and unimolecular respectively. In cases where the molecule is able to stabilize an anion but possesses a poor leaving group, a third type of reaction, E1CB, exists. Finally, the pyrolysis of xanthate and acetate esters proceed through an "internal" elimination mechanism, the Ei mechanism.
Explore contextually related video stories in a new eye-catching way. Try Combster now!
  • Loss of hydron (H<sup>+</sup>) 

  • Types 

  • E2 mechanism 

  • E1 mechanism 

  • Competition among mechanisms 

  • Elimination reactions other than β-elimination