Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 8 (August 2013)

organic compounds

Acta Cryst. (2013). E69, o1231    [ doi:10.1107/S1600536813018503 ]

Ethyl (Z)-4'-(4-eth­oxy-1-hy­droxy-3,4-dioxobut-1-en-1-yl)-[1,1'-biphen­yl]-3-carboxyl­ate

Y. Ishikawa and A. Ugai

Abstract: The 1,3-diketone group of the title compound, C21H20O6, exists in a keto-enol form stabilized by a strong intra­molecular O-H...O hydrogen bond. As a result, a planar (mean deviation = 0.0099 Å) six-membered hydrogen-bonded ring is formed. The C-O and C-C bond lengths suggest significant electron delocalization in the ring. The dihedral angle between the six-membered hydrogen-bonded ring and its adjacent benzene ring is 8.78 (5)° and that between the benzene rings is 19.70 (5)°. In the crystal, mol­ecules are packed in a layered structure parallel to the b axis through C-H...O and [pi]-[pi] inter­actions [centroid-centroid distance between stacked benzene rings = 3.868 (2) Å].

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