4071-18-5Relevant academic research and scientific papers
X-RAY DIFFRACTION STRUCTURAL ANALYSIS OF 2,2,4-TRIMETHYL-SUBSTITUTED 6-HYDROXY-1,2-DIHYDRO- AND 6-OXO-2,6-DIHYDROQUINOLINES
Obodovskaya, A. E.,Starikova, Z. A.,Ivanov, Yu. A.,Pokrovskaya, I. E.
, p. 729 - 733 (1985)
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.
REACTIONS OF N,N'-DIPHENYL-p-QUINONEDIIMINE WITH HYDROQUINONE, α-TOCOPHEROL, AND OTHER ANTIOXIDANTS
Kasaikina, O. T.,Kartasheva, Z. S.,Mazaletskii, A. B.,Sakova, N. Yu.,Shmyreva, Zh. V.,Shikaliev, Kh. S.
, p. 329 - 332 (2007/10/02)
Phenols (hydroquinone and α-tocopherol) and heterocyclic aminophenols (2,2,4-trimethyl-6-ethoxy-1,2-dihydroquinoline) reduce N,N'-diphenyl-p-quinonediimine (A) to the diamine.With difunctional hydrogen atom donors, the reaction rate is proportional to the concentrations of the reactants.The effective rate constants have been determined over a range of temperatures.In the reaction of A with α-tocopherol, plots of rate versus initial concentrations are nonlinear. 2,6-Di-tert-butyl-4-methylphenol and 2,2,4-trimethyl-6-ethoxy-1,2-dihydroquinoline do not react with A under the same conditions.Keywords: N,N'-diphenyl-p-quinonediimide, reduction kinetics, hydroquinone, 2,2,4-trimethyl-6-ethoxy-1,2-dihydroquinoline, 2,6-di-tert-butyl-4-methylphenol (ionol), α-tocopherol, oxidation potentials.
