Question

Is 2-pyrone aromatic?

Answer 1

There is little evidence that 2-pyrone is aromatic.

Explanation:

2-Pyrone is used in organic synthesis as a building block for more complex chemical structures, because it readily undergoes many [4+2]-cycloaddition reactions.

The resulting bicyclic lactones easily lose carbon dioxide to form benzene derivatives.

For example, it readily undergoes a Diels-Alder reaction with hex-3-yne-2,5-dione as follows:

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