Question

Alpha-halogenation are generally acid-catalyzed. does this explain why this reaction is often slow at first, but then proceeds rapidly?

Answer 1

In this reaction, there is no acid (HBr) present at first this is why this reaction is often slow at first.

What is Alpha-halogenation?

Halogens can engage in a substitution reaction with a molecule containing carbonyls and hydrogens. The propensity of carbonyl compounds to generate enolates under basic conditions and enols under acidic conditions is what causes this reaction.

In this reaction, there is no acid (HBr) present. This is why it proceeds slowly at the beginning. Eventually, HBr forms by the reaction of the enol form of m-chloroproiophenone and $Br_{2}$.

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