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C11H8O5, monoclinic, P121/c1 (no. 14), a = 5.1525(6) Å, b = 19.922(2) Å, c = 9.458(1) Å, ) = 100.468(1)°, V = 954.7 Å, Z = 4, R(F) = 0.036, wRref(F) = 0.100, T = 296 K. Source of material 8-Methoxy-2-oxo-2H-chromene-3-carboxylic acid was synthesized according to the reported method [1]. Chemicals used for the synthesis were commercially available of AR grade, and were used as received without further purification. The yellow crystals of the title compound were obtained by slowly evaporating of ethanol solution at room temperature. The crystalline product thus was filtered, washed with ethanol and dried. Single crystals suitable for X-ray diffraction were obtained by recrystallization from ethanol. Experimental details The hydrogen atoms were placed geometrically and refined using a riding model with d(C—H) = 0.93 Å (aromatic) or 0.96 Å (methyl), Uiso(H) = 1.2 Ueq(C) or Uiso(H) = 1.5 Ueq(C) and d(O—H) = 0.82 Å (carboxyl), Uiso(H) = 1.5 Ueq(O).

Crystal structure of 8-methoxy-2-oxo-2H-chromene-3-carboxylic acid, C 11 H 8 O 5