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Pyrones can be used as routes to aromatic rings, however, they are rather unstable and barely aromatic. They can react with alkynes via a Diels-Alder reaction, followed by a reverse Diels-Alder reaction, involving the loss of carbon dioxide, to produce benzene derivatives.
K. Afarinkia, V. Vinader, T. D. Nelson and G. H. Posner, Tetrahedron, 1992, 48, 9111–9171.
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