Acta Cryst. (2006). E62, o5482-o5484  [ doi:10.1107/S1600536806045788 ]

(+)-14b-3-Oxoglycyrrhetinic acid: catemeric hydrogen bonding in a non-racemic triterpenoid diketo acid

H. W. Thompson, R. A. Lalancette and E. M. Kikolski

Abstract: The title compound, (+)-10,13-dioxo-2,4a,6a,6b,9,9,12a-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-eicosahydropicene-2-carboxylic acid, C₃₀H₄₄O₄, aggregates as carboxyl-to-ketone hydrogen-bonding catemers. Hydrogen bonds progress from the carboxyl group of one molecule to the remote-ring ketone group of a translationally related neighbor in an adjoining cell connected by a common a cell-edge [OO = 2.766 (3) Å and O-HO = 163°], yielding chains that extend in the [011] direction. In the crystal structure, there are also four C-HO close contacts.

Online 8 November 2006

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