X-RAY DIFFRACTION STRUCTURAL ANALYSIS OF 2,2,4-TRIMETHYL-SUBSTITUTED 6-HYDROXY-1,2-DIHYDRO- AND 6-OXO-2,6-DIHYDROQUINOLINES

Article abstract of DOI:10.1007/BF00773268

An x-ray diffraction structural analysis was carried out on 6-hydroxy-1,2-dihydro- and 6-oxo-2,6-dihydro-2,2,4-trimethylquinolines on a diffractometer using λMo radiation.The structure was solved by the direct method and refined by the anisotropic method of least squares to give R = 0.044 and 0.040.The dihydrogenated ring in the 6-hydroxy derivative is nonplanar.The length of the C-C(=C) bond (1.470 Angstroem) and the nonplanarity of the ?-systems of the C=C double bond and of the benzene ring (dihedral angle 15.4 deg) indicate less conjugation in comparison with planar molecules.