organic compounds
Open access
The asymmetric unit of the title compound, C17H12O4, consists of two independent molecules. The chromen-2-one ring and the 4-methylbenzoate side chain are inclined to one another at a dihedral angle of 64.79 (10)° in one molecule and 88.3 (1)° in the other. In the crystal, molecules form R22(8) centrosymmetric dimers via C—HO hydrogen bonds. These dimers are stacked by C—HO hydrogen bonds, resulting in R22(18) and R32(16) ring motifs. π–π stacking interactions between two parallel chromen-2-one rings, with centroid–centroid distances of 3.743 (1) and 3.771 (1) Å, are also present.
organic compounds
Open access
In the title compound, C12H10O4, the atoms of the 2-oxo-2H-chromene ring system and the non-H atoms of the 4-substituent all lie on a crystallographic mirror plane. The molecular structure exhibits an intramolecular C—HO hydrogen bond, which generates an S(6) ring. In the crystal, molecules form R32(12) trimeric units via C—HO interactions which propagate into layers parallel to the ac plane. These layers are linked by weak C—HO interactions along the [010] direction, generating a three-dimensional network.