Home > Organic Chemistry > Comparing and Determing SN1 or SN2 and E1 or E2 reactions

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

Answer 1

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,

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Answer 2

Isaac Aronson

The E1 and E2 mechanisms give alkenes as the major products.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.