Results 61 to 70 of about 132,796 (171)
Arabian Journal of Chemistry, 2017 In this paper, three novel series of 5-long chain alkenyl/hydorxyalkenyl-1,3,4-oxadiazol-2-thiones 2(a–d), 4-amino-5-long chain alkenyl/hydroxyalkenyl-1,2,4-triazol-3-thiones 3(a–d) and 3-long chain alkenyl/hydroxyalkenyl-6-phenyl-(7H)-1,2,4-triazolo[3,4-
Aiman Ahmad +4 more
doaj +1 more source
Molecules, 2016 Chemically diverse heterocyclic chalcones were prepared and evaluated for cytotoxicity, aiming to push forward potency and selectivity. They were tested against rhabdomyosarcoma (RMS) and noncancerous cell line (LLC-PK1).
Tuong-Ha Do +7 more
doaj +1 more source
Molecules, 2020 A new series of nitrogen and sulfur heterocyclic systems were efficiently synthesized by linking the following four rings: indole; 1,2,4-triazole; pyridazine; and quinoxaline hybrids. The strength of the acid that catalyzes the condensation of 4-amino-5-(
Ahmed T. A. Boraei +3 more
doaj +1 more source
Ibn Al-Haitham Journal for Pure and Applied Sciences, 2017 This work includes the synthesis of some new five- seven heterocyclic rings derived from benzenesulfonylhydrazide as starting material. Its condensation with 4-methoxy and 4nitro benzaldehyde gives the Schiff bases (1a,b).
Ismaeel Y. Majeed +3 more
doaj
Antinociceptive grayanane-derived diterpenoids from flowers of Rhododendron molle
Acta Pharmaceutica Sinica B, 2020 Twelve new grayanoids (1−12) along with five known compounds were isolated from flowers of Rhododendron molle. Their structures were fully characterized using a combination of spectroscopic analyses, computational calculations, and single crystal X-ray ...
Yong Li +7 more
doaj
A Novel Heterocyclic System Based on Natural Epoxyalantolactone
Frontiers in Chemistry, 2019 Natural sesquiterpene lactones which contain an exocyclic methylene group in the β-position of the lactone ring react readily with N-nucleophiles. When studying the reaction of the natural epoxyalantolactone with the primary amines we demonstrate the ...
Sergey G. Klochkov +9 more
doaj +1 more source
Thermally Stimulated Luminescence and Current in new heterocyclic materials for Organic field transistors and organic light emitting diodes [PDF]
arXiv, 2007 The present work is focused on theoretical and experimental study of localised levels in organic materials suitable for light-emitting devices and field effect transistors by means of thermal techniques. In our work we focused on low molecular compounds as well as on polymers, especially of two classes of materials: oxadiazoles and quinoxalines.
arxiv
Synthesis and Diuretic Activity of Substituted 1,3,4-Thiadiazoles
Scientifica, 2022 1,3,4-Thiadiazole nuclease, a 5-membered heterocyclic ring system containing two nitrogen and one sulfur atoms in addition to carbon atoms, is compound that showed promising results in the process of searching new diuretic agents. In this study, seven 5-
Asrat Ergena +2 more
doaj +1 more source
1,1-Diphenyl-2-picrylhydrazyl and superoxide anion radical scavenging 1 activities of heterocyclic 2-oxo-1,2,3,4-tetrahydropyrimidines [PDF]
arXiv, 2023 To investigate1,1-Diphenyl-2-picrylhydrazyl (DPPH) and superoxide radical (SOR) 17 scavenging activities of 2-oxo-1,2,3,4-tetrahydropyrimidines derivatives. Free radicals are 18 highly unstable and reactive molecules/atoms. In the body, free radicals form during 19 normal and abnormal metabolism in the body and cause serious damage to other 20 ...
arxiv
, 2017 A direct approach to the synthesis of previously unknown 1H-1,2,3-triazolylfuroxans, involving nucleophilic substitution of the nitro group in nitrofuroxans followed by catalytic [3+2] cycloaddition of intermediate azidofuroxans to 1,3-ketoesters, is ...
A. Kulikov +10 more
semanticscholar +1 more source