91Ó°ÊÓ

The 2-steps elimination reaction where the formation of the carbocation is the intermediate step is known as the E1 reaction. A proton and a leaving group get removed from the system. In this case, the rate depends only on the substrate.

E1 is favorable in those cases where the carbocation formed in the intermediate step is stable.

The major product will be considered in those compounds where more number of substituted alkenes are formed.

With an increase in the number of substituted alkyl groups, more +I effect will be shown by them. As a result, the stability of the product formed increases.

Hence, the major product formed in an E1 reaction is:

Representation of E1 product from compound a

Representation of E1 product from compound b

Representation of E1 product from compound c