The asymmetric unit of the title compound, C11H10O3, contains two crystallographically independent molecules (AandB) with nearly matching conformations. Both molecules are almost planar [r.m.s. overlay fit for the non-hydrogen atoms = 0.011 (1) Å] and in each molecule there is a short intramolecular C—H...O contact. In both molecules, the OH group of the acetic acid residue occupies a position approximately antiperiplanar to the C atom of the heterocycle. In the crystal, the two molecules are linked by a pair of O—H...O hydrogen bonds, enclosing anR22(8) ring motif and forming anA–Bdimer. The dimers are linked by C—H...π interactions, forming columns along the [010] direction.
The asymmetric unit of the title compound, C11H10O3, contains two crystallographically independent molecules,AandB, with closely matching conformations (r.m.s. overlay fit = 0.105 Å). In each case, the OH group of the acetic acid residue occupies a position approximately antiperiplanar to the C atom of the heterocycle. A short intramolecular C—H...O contact occurs within each molecule. In the crystal, carboxylic acidA+Bdimers generateR22(8) loops.
In the title compound, C12H12O3, the dihedral angle between the planes of the carboxylic acid group and the benzofuran ring system (r.m.s. deviation = 0.012 Å) is 76.53 (10)°. In the crystal, carboxylic acid inversion dimers linked by pairs of O—H...O hydrogen bonds generateR22(8) loops. C—H...O interactions link the dimers into (101) sheets.
The title compound, C19H19NO2, is non-planar with the phenyl ring of the phenethylacetamide residue inclined to the benzofuran ring system by 84.8 (3)°. The methyl group lies in the plane of the fused ring system [C—C—C—C torsion angle = −179.6 (3)°]. In the crystal, N—H...O hydrogen bonds link the molecules into chains along thea-axis direction. π–π stacking interactions with a centroid-to-centroid distances of 3.497 (3) Å further stabilize the structure, stacking the molecules alonga.
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