(+/-)-3-Ethyl-2-methyl-4-oxocyclohexanecarboxylic acid: catemeric hydrogen bonding in a cyclic delta-keto acid.
In the title compound, C(10)H(16)O(3), the two molecules of the asymmetric unit form acid-to-ketone hydrogen-bonded chains. The two species differ only very slightly and are related by a pseudo-center, so that the apparent translational relationship among the units of the hydrogen-bonded chain is actually a pseudo-translation, with the molecules alternating in type. Two counterdirectional pairs of chains proceed through each cell [O.O = 2.743 (2) and 2.683 (2) A, and O-H.O = 171 (3) and 157 (3) degrees ]. Three intermolecular C-H.O close contacts were found, involving all three O atoms of one of the molecules.
Davison
Mark
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Carl A. Olson Memorial Laboratories, Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
Kikolski
Elizabeth M
EM
Lalancette
Roger A
RA
Thompson
Hugh W
HW