- Synthesis and structure of 5,7-diisopropyl-2-(quinolin-2-yl)-1,3-tropolone derivatives
-
A synthetic procedure towards 4,6-diisopropyl-3-nitro-1,2-benzoquinone was elaborated. Based on this benzoquinone, a series of novel 5,7-diisopropyl-2-(quinolin-2-yl)-1,3-tropolones and 5,7diisopropyl-2-(quinolin-2-yl)-4-nitro-1,3-tropolones were derived. Molecular structure of 2-(4-chloro-8-methylquinolin-2-yl)-5,7-diisopropyl-1,3-tropolone was established by X-ray diffraction analysis. Energetic and structural characteristics of isomeric 5,7-diisopropyl-2-(quinolin-2yl)-1,3-tropolones and 5,7-diisopropyl-2-(quinolin-2-yl)-4-nitro-1,3-tropolones in the gas phase and in the polar solvent were calculated by quantum chemistry method (PBE0/6-311+G(d,p)).
- Sayapin, Yu. A.,Duong, Nghia Bang,Gusakov,Dorogan,Tkachev,Gorkovets,Komissarov,Duong, Ngoc Toan,Nguyen, Dang Duc,Shilov,Aldoshin,Minkin
-
-
Read Online
- Isopropyl-substituted o-benzoquinones and oxanthrenequinones. Effect of steric shielding of alkyl substituents on reactivity
-
A synthetic procedure was developed for the preparation of sterically hindered di- and trisubstituted catechols and o-quinones by the reaction of catechol with isopropanol. Compared to sterically more hindered analogs, o-quinones bearing isopropyl substituents exhibit a higher reactivity toward the formation of oxanthrenequinone derivatives.
- Arsenyev, M. V.,Baranov, E. V.,Cherkasov, V. K.,Druzhkov, N. O.,Kocherova, T. N.,Kuropatov, V. A.,Shavyrin, A. S.
-
p. 916 - 924
(2021/06/07)
-
- Sonocatalytic removal of naproxen by synthesized zinc oxide nanoparticles on montmorillonite
-
ZnO/MMT nanocomposite as sonocatalyst was prepared by immobilizing synthesized ZnO on the montmorillonite surface. The characteristics of as-prepared nanocomposite were studied by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD) techniques. The synthesized samples were used as a catalyst for sonocatalytic degradation of naproxen. ZnO/MMT catalyst in the presence of ultrasound irradiation was more effective compared to pure ZnO nanoparticles and MMT particles in the sonocatalysis of naproxen. The effect of different operational parameters on the sonocatalytic degradation of naproxen including initial drug concentration, sonocatalyst dosage, solution pH, ultrasonic power and the presence of organic and inorganic scavengers were evaluated. It was found that the presence of the scavengers suppressed the sonocatalytic degradation efficiency. The reusability of the nanocomposite was examined in several consecutive runs, and the degradation efficiency decreased only 2% after 5 repeated runs. The main intermediates of naproxen degradation were determined by gas chromatography-mass spectrometry (GC-Mass).
- Karaca, Melike,Kiran?an, Murat,Karaca, Semra,Khataee, Alireza,Karimi, Atefeh
-
p. 250 - 256
(2016/01/16)
-
- Synthesis and Antioxidant Properties of Some Derivatives of Alkylated Pyrocatechol
-
Alkylated 1,3-benzodioxane, 1,3-benzoxathiole, o-aminophenols, and 2,3-dihydro-1,3-benzoxazoles were obtained from 3,5-di-tert-butylbenzene-1,2-diol. The antiradical and antioxidant activities of these compounds were examined in the model oxidation of hexane, initiated by γ irradation. The antiradical activity of the ortho analog of tocopherol with a five-membered ring, 7-hydroxy-4,6-di-tert-butyl-1,3-benzoxathiole-2-thione, exceeds fourfold that of the six-membered analog, 8-hydroxy-5,7-di-tert-butyl-1,3-benzodioxane.
- Maslovskaya,Petrikevich,Timoshchuk,Shadyro
-
p. 1842 - 1846
(2007/10/03)
-