Which mechanism(s) give(s) alkenes as the major products, Sn1, Sn2, E1, or E2?

1 Answer
May 20, 2015

E1 and E2 mechanisms give alkenes at the products.

In organic chemistry, an elimination reaction is a reaction in which two substituents are removed from a molecule to form an alkene.

The substituents are usually from adjacent carbons.

Most often, one of them is a hydrogen atom and the other is called the leaving group.


An E2 elimination is a concerted one-step process in which the leaving group X departs at the same time as the base B attacks the β hydrogen.


An E1 elimination is a two-step process.

In the first (and rate-determining) step, the leaving group X departs to form a carbocation.


In the second step, the base B attacks the β hydrogen atom and forms the alkene,