Acta Cryst. (2013). E69, o408-o409 [ doi:10.1107/S1600536813004017 ]
Abstract: The title bis-piperidine, C26H28N2O3, was unexpectedly obtained via a dimerization mechanism promoted by acetic acid when performing the Dieckmann cyclization of a chiral amido ester. The S,S configuration was assigned by reference to the enantiomerically pure starting material. In the molecule, two core heterocycles are linked by a bond. One ring includes a keto-enol group, while the other presents an enone functionality. Both rings present a conformation intermediate between envelope and screw-boat, and the dihedral angle between the mean planes passing through the rings [48.9 (1)°] is large enough to avoid hindrance between ring substituents. The enol tautomeric form in one ring favors the formation of strong intermolecular O-HO=C hydrogen bonds. The resulting one-dimensional supramolecular structure features single-stranded helices running along the 21 screw axis parallel to .
Hyper-Text Markup Language (HTML) file
Chemical Markup Language (CML) file
To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.
The download button will force most browsers to prompt for a file name to store the data on your hard disk.
Where possible, images are represented by thumbnails.
Copyright © International Union of Crystallography