Acid-catalyzed halogenation is synthetically useful for converting ketones to α, β-unsaturated ketones, which are useful in Michael reactions (Section 22-18). Propose a method for converting cyclohexanone to cyclohex-2-en-1-one, an important synthetic starting material.

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O H H ketone a.ß-unsaturated cyclohexanone cyclohex-2-en-1-one