Furfural: spot the fabricated intermediate

Single question

Two-step route to furfural from xylose: acid-catalyzed dehydration through an intermediate, then aromatization to furfural. Step 1 draws an isolated bicyclic intermediate. Inspect that structure carefully.

Pentose dehydration mechanism

Beta-dicarbonyl intermediates in sugar chemistry

Distinguishing fused-ring inventions from real open-chain intermediates

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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