Results 21 to 30 of about 24,157 (222)
Diazanaphthalenes: A 13C NMR investigation on the site of protonation and pKa values [PDF]
, 1976 The pH dependence of the 13C chemical shifts (δ) of the diazanaphthalenes has been recorded. From this dependence the pKa values have been determined using the Henderson-Hasselbach equation.
Meer, Douwe van der +2 more
core +2 more sources
(Phenyl)(3-phenylsulfonyl-1,2-dihydropyrrolo[1,2-a]quinoxalin-1-yl)methanone
Acta Crystallographica Section E, 2011 In the title molecule, C24H18N2O3S, the 13-atom ring system comprising the quinoxaline and fused five-membered ring exhibits an r.m.s. deviation from coplanarity of 0.039 Å, with a maximum deviation of 0.0710 (10)  ...
Yaşar Dürüst +2 more
doaj +1 more source
7,8-Dimethyl-11H-indeno[1,2-b]quinoxalin-11-one
IUCrData, 2021 In the title compound, C17H12N2O, the mean planes of the indene ring and quinoxaline system (r.m.s. deviations = 0.0131 and 0.0082 Å) are approximately parallel to one another, making a dihedral angle of 1.2 (5)°.
Lin Chen, Jin Hu, Hong-Shun Sun
doaj +1 more source
Aminoquinoxaline-Based Dual Colorimetric and Fluorescent Sensors for pH Measurement in Aqueous Media
Chemosensors, 2022 This research is focused on the development of pH indicators based on the quinoxaline signaling group for acidic aqueous solutions (pH 1–5). A push–pull quinoxaline QC1 in which two electron-donating (3-aminopropyl)amino substituents are attached to ...
Elizaveta V. Ermakova +2 more
doaj +1 more source
The photoelectron spectra of the diazanaphthalenes [PDF]
, 1972 The high-resolution He 584 Å photoelectron spectra of ten diazanaphthalenes are presented. The ordering of the π orbitals and the nitrogen “lone-pair” orbitals is discussed.
Ham, D.M.W. van den, Meer, D. van der
core +3 more sources
Acta Crystallographica Section E Structure Reports Online, 2010 A new Z' = 1 crystal structure of quinoxaline (or 1,4-diaza-naphthalene), C(8)H(6)N(2), with one-fifth the volume of the earlier known Z' = 5 structure was obtained by means of an in situ cryocrystallization technique.
Ranganathan, Sathishkumar +3 more
openaire +2 more sources
Chemistry, Synthesis, and Structure Activity Relationship of Anticancer Quinoxalines
Chemistry, 2023 Quinoxaline is a fused heterocycle system of a benzene ring and pyrazine ring. It has earned considerable attention due to its importance in the field of medicinal chemistry.
Mohamed F. Zayed
doaj +1 more source
Electrochemical behavior of indolone-N-oxides: Relationship to structure and antiplasmodial activity [PDF]
, 2012 Indolone-N-oxides exert high parasiticidal activity at the nanomolar level in vitro against Plasmodiumfalciparum, the parasite responsible for malaria.
Fabre, Paul-Louis +6 more
core +3 more sources
Quinoxaline: A comprehension of current pharmacological advancement in medicinal chemistry
European Journal of Medicinal Chemistry Reports, 2022 Quinoxaline is a fused heterocycle ring template present in diverse pharmacophore and widely used in medicinal chemistry. Owing to its vast pharmaceutical profile, several quinoxalines analogous displayed their distinct pharmacological activities. In the
Suresh Kumar Suthar +4 more
doaj +1 more source
Diazo Transfer From Nitrous Oxide Employing Phosphorus Ylides
Angewandte Chemie, EarlyView.A phosphorus ylide‐mediated strategy achieves the direct fixation of nitrous oxide (N2O) to access diazo compounds, which after intra‐ or intermolecular trapping, afford N2‐containing organic building blocks. This approach provides an alternative to hazardous diazo‐transfer reagents and establishes N2O fixation as a sustainable methodology.
Jhen‐Kuei Yu +4 more
wiley +2 more sources