| Summary: | In the title compounds, C10H8O2, (I), and C13H14O3, (II), the 2-acetyl-4-ethynylphenol unit displays a planar geometry, which is stabilized by an intramolecular O—H...O hydrogen bond. The crystal structure of (I) is constructed of infinite strands, along [101], of C—H...O=C hydrogen-bonded molecules, which in turn are linked by C—H...π interactions. In the crystal of (II), which crystallized with three independent molecules per asymmetric unit, the non-polar parts of the molecules form hydrophobic layered domains, parallel to (10-1), which are separated by the polar groups. While the 2-acetylphenol part of the molecules are involved in O—H...O=C hydrogen bonding, the ternary OH groups creates a cyclic pattern of O—H...O hydrogen bonds.
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