The correct product of the transformation derives from the process of alpha halogenation after which there is and E2 elimination. See the attached.
What is Alpha Halogenation?
A useful reaction to add leaving groups at the alpha position for subsequent substitution or elimination reactions is alpha halogenation.
Alpha halogenation can occur in basic or acidic environments. See Step I and Step II of the halogenation process attached.
What are the types of halogenation?
Halogenation reactions may be divided into two categories:
- (A) substitution processes, in which the halogen replaces another atom in the molecule, such as when ethane is chlorinated, and
- (B) addition reactions, in which the halogen combines with an unsaturated molecule.
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