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Vanillin: spot the wrong base

Single question

A one-step Reimer-Tiemann formylation of guaiacol delivers vanillin. The structures and the carbon source (CHCl3) are right. Check the base.

Reimer-Tiemann formylation
Dichlorocarbene generation
Why aqueous NaOH is non-negotiable

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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