1,5-Diphenylpentane-2,4-dione and 1,5-bis(2-naphthyl)pentane-2,4-dione

Both title compounds, 1,5-diphenylpentane-2,4-dione, (1), and 1,5-bis(2-naphthyl)pentane-2,4-dione, (2), exist in the enol form and have a planar enol ring with a short crystallographically symmetric hydrogen bond. In addition, the molecules possess twofold rotation symmetry so that the ketone and enol functionalities are completely delocalized.

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