Alpha,beta-unsaturated ketoximes carrying a terminal pyridine or quinoline subunit as building blocks for supramolecular syntheses.
[Structure: see text]. The crystal structures of a new series of alpha,beta-unsaturated ketoximes, 8-14, carrying the terminal 4-pyridinyl, 3-pyridinyl, or 4-quinolinyl subunit have been investigated by X-ray structural analysis. The dominating intermolecular interaction in all structures, except 11, is the head-tail OH...N hydrogen bond between the oxime moiety and the nitrogen atom of the heterocyclic unit. This intermolecular interaction generates infinite chains, which are cross-linked by CH...O/N/Cl or CH...pi interactions. Compound 10 has been shown to adopt a double-helical structure in the crystalline state. Compound 11 represents the only case where the unexpected head-head NOH...N(OH) hydrogen bonds determine the crystal packing. Both hydrogen-bonding and aromatic interactions stabilize the crystal structures of 8-14.
Mazik
Monika
M
Institut für Organische Chemie der Technischen Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany. m.mazik@tu-bs.de
Bläser
Dieter
D
Boese
Roland
R