title: (±)-trans-3-Oxo-1,2,3,4,4a,9,10,10a-octa-hydro-phenanthrene-10a-carboxylic acid: catemeric hydrogen bonding in a δ-keto acid.
abstract: The title compound, C(15)H(16)O(3), aggregates as hydrogen-bonded catemers progressing from each carboxyl to the ketone of a screw-related neighbor [O⋯O = 2.6675 (14) Å and O-H⋯O = 170°]. Two parallel centrosymmetrically related single-strand hydrogen-bonding helices proceed through the cell in the b-axis direction. The packing includes three inter-molecular C-H⋯O=C close contacts, involving both the ketone and the carboxyl group. The structure is isomorphous with that of the previously described Δ(4) α,β-unsaturated ketone.
authors.affiliation: Carl A. Olson Memorial Laboratories, Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: Davison
authors.forename: Roger A
authors.initials: RA
authors.lastname: Lalancette
authors.forename: Hugh W
authors.initials: HW
authors.lastname: Thompson
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Miller