title: Crystal structures of 2-acetyl-4-ethynylphenol and 2-acetyl-4-(3-hy-droxy-3-methylbut-1-yn-1-yl)phenol.
abstract: In the title compounds, C10H8O2, (I), and C13H14O3, (II), the 2-acetyl-4-ethynylphenol unit displays a planar geometry, which is stabilized by an intra-molecular O-H⋯O hydrogen bond. The crystal structure of (I) is constructed of infinite strands, along [101], of C-H⋯O=C hydrogen-bonded mol-ecules, which in turn are linked by C-H⋯π inter-actions. In the crystal of (II), which crystallized with three independent mol-ecules per asymmetric unit, the non-polar parts of the mol-ecules form hydro-phobic layered domains, parallel to (10-1), which are separated by the polar groups. While the 2-acetyl-phenol part of the mol-ecules are involved in O-H⋯O=C hydrogen bonding, the ternary OH groups creates a cyclic pattern of O-H⋯O hydrogen bonds.
authors.affiliation: Institut für Organische Chemie, TU Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg/Sachsen, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Hübscher
authors.affiliation: Institut für Organische Chemie, TU Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg/Sachsen, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Rosin
authors.affiliation: Institut für Organische Chemie, TU Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg/Sachsen, Germany.
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Seichter
authors.affiliation: Institut für Organische Chemie, TU Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg/Sachsen, Germany.
authors.forename: Edwin
authors.initials: E
authors.lastname: Weber
keywords: 2-acetyl­phenol; C—H⋯π inter­actions; crystal structure; di­methyl­hydroxy­meth­yl; ethyn­yl; hydrogen bonding