Caprolactam: spot the conditions flaw

Single question

Two-step route to caprolactam: oxime the cyclohexanone, then Beckmann rearrange to the lactam. Reactants and reaction classes are right. Check the catalyst on the rearrangement step.

Beckmann rearrangement of cyclohexanone oxime

Strong-acid activation of oximes for [1,2]-alkyl migration

Why dilute HCl cannot drive the Beckmann

Find the flaw

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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