Results 91 to 100 of about 7,946 (266)

Synthesis, Identification, and Study of the Biological Activity of Some New Pyrimidine, Oxazine, and Thiazine Derivatives Through Reactive Chalcones [PDF]

, 2023
The synthesis of novel chalcone derivatives [C1–C5] using the Claisen-Schmidt condensation method is part of this work. Subsequently, chalcones were treated with guanidine hydrochloride, urea, thiourea, and thioacetamide, respectively, in the presence of
Abdulhussein, Nooralhuda Mohammed, Abood, Zeid Hassan   +1 more
core   +1 more source

THEORETICAL AND CHEMOMETRIC STUDY OF SUBSTITUTED OXAZINES

Journal of the Chilean Chemical Society, 2005
The application of the Principal Component of Analysis (PCA) over the theoretical data of a series of substituted 1,3-oxazines helps to determine the factors that rule the conformational equilibrium. Repulsive and intertribal syn-1,3-diaxial interactions have been used as determiners for the axial structures, whereas dipolar interactions are preferred ...
CONTRERAS, J. GUILLERMO, FERREIRA, MARCIA M.C, HURTADO, S. MARCELA, GERLI, LORENA, CASTILLO, ROSARIO   +4 more
openaire   +3 more sources

Synthesis and characterization of new Oxazine , Thiazine and Pyrazol derived from chalcones [PDF]

, 2014
In this study, chalcones were synthesis by condensing 2-acetylpyridine with aromatic aldehyde derivatives in dilute ethanolic potassium hydroxide solution at room temperature according to Claisen-Schmidt condensation.
Sallal, Zainab Amer
core   +2 more sources

Iminoéthers-1 3 cycliques : chimie et applications dans le domaine des additifs pétroliers et des matériaux organiques Cyclic 1,3-Iminoethers: Chemistry and Applications in the Field of Petroleum Additives and Organic Materials

Oil & Gas Science and Technology, 2006
Cet article est consacré aux iminoéthers-1,3 cycliques les plus courants : les oxazines-1,3 et oxazolines-1,3. La première partie rappelle les synthèses de ces composés et quelques aspects récents de leur chimie : réactions d'hydrolyse, réactions de ...
Le Perchec P., Sillion B., Salle R.
doaj   +1 more source

Synthesis of 2-substituted benzimidazole, coumarin, benzo[b][1,4]oxazin and dihydropyrimidinone derivatives using core-shell structured Fe3O4@SiO2-ZnCl2 nanoparticles as an effective catalyst

Results in Chemistry, 2020
In this paper, a magnetic nanocatalyst of Fe3O4@SiO2-ZnCl2 has been used which enhances the synthesis of benzimidazoles, coumarins, benzoxazines and dihydropyrimidinones. To begin with, 2-substituted benzimidazoles have been synthesized in proper to high
Saba Rahimi, Ebrahim Soleimani
doaj  

TiCl4: An efficient catalyst for one-pot synthesis of 1,2-dihydro-1-aryl-naphtho-[1,2-e][1,3]oxazin-3-one derivatives and their drug score analysis

Arabian Journal of Chemistry, 2017
Multi-component, economical and efficient synthesis of 1,2-dihydro-1-aryl-naphtho[1,2-e][1,3]-oxazin-3-one derivatives (4a–k) with an excellent yield is described through a one-pot condensation of β-naphthol, aromatic aldehydes and urea in presence of ...
Raveendra Hunnur, Ravindra Kamble, Atukuri Dorababu, B. Sunil Kumar, Chinna Bathula   +4 more
doaj   +1 more source

XXXVI.—A reaction of certain colouring matters of the oxazine series [PDF]

, 1907
Jocelyn Field Thorpe
openalex   +1 more source

Electron Spin Resonance in Solid State Samples of Phenothiazine and Oxazine Dyes. [PDF]

, 1961
Carl Lagercrantz, Margareta Yhland, Anders Evang, W. G. Terry, Berndt Sjöberg, Jens Toft   +5 more
openalex   +1 more source

Synthesis of novel naphtho[1,2-e][1,3]oxazines bearing an arylsulfonamide moiety and their anticancer and antifungal activity evaluations

Arabian Journal of Chemistry, 2020
A series of novel naphtho[1,2-e][1,3]oxazines bearing arylsulfonamide moiety have been synthesized via a one-pot approach and in a green reaction medium.
Seyed Gholamhossein Mansouri, Hassan Zali-Boeini, Kamiar Zomorodian, Bahman Khalvati, Razie Helali Pargali, Ali Dehshahri, Hadi Amiri Rudbari, Mehdi Sahihi, Zahra Chavoshpour   +8 more
doaj  

Reactions with 2H-Pyrido[2,3-e]-1,3-oxazine-2,4-(3H)-dione. [PDF]

, 1966
Niels Clauson-Kaas, Gert Jansen, Eivor Holmberg, Marc Wagnières, D. H. Williams, E. Bunnenberg, Carl Djerassi, Ruth Records   +7 more
openalex   +1 more source