Results 21 to 30 of about 132,796 (171)
Charge Migration in Heterocyclic Five-Membered Rings [PDF]
, 2023 This contribution presents numerical simulations of N-electron dynamics in heterocyclic five-membered ring molecules to shed light on the effect of molecular symmetry on charge migration. Laser-driven dynamics is studied using the hybrid time-dependent density functional theory/configuration methodology, and the ensuing field-free charge migration is ...
arxiv +1 more source
Synthesis and Antibacterial Activity of bis Heterocyclic Derivatives of 1,3,4-thiadiazole
Iraqi Journal of Pharmaceutical Sciences, 2017 The Chemistry of heterocyclic sulphur and nitrogen containing compounds have a great role in the field of scientific studies, The 2-amino 5-mercapto-1,3,4-thiadiazole ring for instance, has gained more importance in recent years because they are ...
Ahlam A. Al-jubouri +1 more
doaj +3 more sources
Molecules, 2017 Thirty six novel heterocyclic derivatives of ethyl 2-(2-pyridylacetate) were efficiently synthesized. The new compounds involve the linkage of a 2-pyridyl ring with thiosemicarbazide (compounds 1–7), 1,2,4-triazole (compounds 1a–7a), 1,3,4-thiadiazole ...
Daniel Szulczyk +7 more
doaj +1 more source
optimizing the searches for interstellar heterocycles [PDF]
, 2021 It is a fact that interstellar formation processes are thermodynamically affected. Based on this, the seven heterocycles; imidazole, pyridine, pyrimidine, pyrrole, quinoline, isoquinoline and furan that have been searched for from different astronomical sources with only upper limits of their column density determined without any successful detection ...
arxiv +1 more source
Quantum Rate Electrodynamics and Resonant Junction Electronics of Heterocyclic Molecules [PDF]
arXiv, 2023 Quantum rate theory encompasses the electron-transfer rate constant concept of electrochemical reactions as a particular setting, besides demonstrating that the electrodynamics of these reactions obey relativistic quantum mechanical rules. The theory predicts a frequency $\nu = E/h$ for electron-transfer reactions, in which $E = e^2/C_q$ is the energy ...
arxiv
Crystal structure of 4-(2-bromopropionyl)-3-phenylsydnone
Acta Crystallographica Section E, 2014 Sydnones are a class of mesoionic compounds containing a five-membered heterocyclic ring. In general, sydnone compounds are synthesized with an aromatic substutuent at the N3 position. This feature, adds to the stability of the heterocyclic ring.
D. Grossie, L. Harrison, K. Turnbull
doaj +1 more source
SYNTHESIS, CHARACTERIZATION AND KINETIC STUDIES OF SOME OXAZEPINE AND OXAZEPANE DERIVATIVES [PDF]
مجلة جامعة الانبار للعلوم الصرفة, 2012 1,3-Bis(2-hydroxy-benzylidene)-Thiourea and 1,3-Bis-(dimethylamino-benzylidene)-Thiourea were prepared by condensation of Thiourea with one equivalent and two equivalent of substituted benzaldehyde.
Waleed F. AL-Hity +2 more
doaj +1 more source
CdS nanoparticles capped with 1-substituted 5-thiotetrazoles: Synthesis, characterization, and thermolysis of the surfactant [PDF]
Chem. Mater. 20 (2008) 4545, 2013 We propose a new type of surfactants, namely, tetrazole derivatives which can be controllably removed from the nanoparticle surface. Tetrazoles are a peculiar class of heterocyclic compounds. The presence of four nitrogen atoms in the tetrazole ring determines their interesting physical and chemical properties.
arxiv +1 more source
Molecules, 2015 Triazole derivatives constitute an important group of heterocyclic compounds have have been the subject of extensive study in the recent past. These compounds have shown a wide range of biological and pharmacological activities.
Lidija Kosychova +6 more
doaj +1 more source
Molecules, 2012 Spiro-N,N-ketal 5, consisting of a phthaloperine heterocyclic ring and a naphtha[1,8-ef][1,4]diazepine ring, was obtained along with spiro-N,N-ketal 2 via 2,2-condensation in the reaction of ninhydrin with naphthalene-1,8-diamine.
Keiji Kobayashi +4 more
doaj +1 more source