The title compound, C12H14O3, exists only as the enol tautomer in CDCl3 solution and in the solid state. Its X-ray crystal structure reveals a near symmetrical enol ring in which the R (O ⋯ O)= 2.449 Å indicates a very strong hydrogen bond. I.r. and n.m.r. [Δδ(H,D)] data support this result.
J. Emsley, N. J. Freeman, P. A. Bates and M. B. Hursthouseb, J. Chem. Soc., Perkin Trans. 1, 1988, 297 DOI: 10.1039/P19880000297
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