Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 1 (January 2013)

organic compounds

Acta Cryst. (2013). E69, o54-o55    [ doi:10.1107/S1600536812049203 ]

(Z)-Ethyl 2-hy­droxy-4-oxo-4-(1,4,5,6,8-penta­meth­oxy­naphthalen-2-yl)but-2-enoate

A. Pillay, S. Khorasani and C. B. de Koning

Abstract: The title compound, C21H24O9, crystallizes with two independent mol­ecules in the asymmetric unit which are almost centrosymmetrically related to each other. The ethano­ate group in one of the two mol­ecules is disordered over two positions with a site-occupation factor of 0.880 (7) for the major occupied site. In the crystal, the 1,3-diketone group exists in the keto-enol isomeric form due to the stabilizing effect of the intra­molecular O-H...O hydrogen bond present in this form. The compound packs as a layered structure in which C-H...[pi] and C-H...O inter­actions are present within and between the layers.

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