Results 31 to 40 of about 3,172,708 (264)
Recent Advances in Heterocyclic Nanographenes and Other Polycyclic Heteroaromatic Compounds
Chemical Reviews, 2021 This review surveys recent progress in the chemistry of polycyclic heteroaromatic molecules with a focus on structural diversity and synthetic methodology. The article covers literature published during the period of 2016–2020, providing an update to our
Arseni Borissov +5 more
semanticscholar +1 more source
Scientific Reports, 2022 In this work, a new periodic mesoporous organosilica with urea-bridges produced by the reaction of (3-aminopropyl)triethoxysilane and toluene-2,4-diisocyanate (APS-TDU-PMO) is introduced.
Ehsan Valiey, Mohammad G. Dekamin
doaj +1 more source
Internal conversion and intersystem crossing pathways in UV excited, isolated uracils and their implications in prebiotic chemistry [PDF]
Phys. Chem. Chem. Phys. 18, 20168 (2016), 2019 The photodynamic properties of molecules determine their ability to survive in harsh radiation environments. As such, the photostability of heterocyclic aromatic compounds to electromagnetic radiation is expected to have been one of the selection pressures influencing the prebiotic chemistry on early Earth.
arxiv +1 more source
Journal of Organic Chemistry, 2020 The high demand for new and efficient routes toward synthesis of nitrogen-containing heterocyclic scaffolds has inspired organic chem-ists to discover several methodologies over recent years.
Dongari Yadagiri +2 more
semanticscholar +1 more source
Fan-shaped and toric textures of mesomorphic oxadiazoles [PDF]
Phase Transitions, Vol.80, 987-998, 2007, 2007 When a family of non symmetrical heterocycled compounds is investigated, a variety of mesophases can be observed with rather different features. Here we report the behaviour of seven different members among a family of such materials, that consists of mesomorphic oxadiazole compounds.
arxiv +1 more source
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
Oxygen-bearing organic molecules in comet 67P's dusty coma: first evidence for abundant heterocycles [PDF]
A&A 678, A22 (2023), 2023 The puzzling complexity of terrestrial biomolecules is driving the search for complex organic molecules in the Interstellar Medium (ISM) and serves as a motivation for many in situ studies of reservoirs of extraterrestrial organics from meteorites and interplanetary dust particles (IDPs) to comets and asteroids. Comet 67P/Churyumov-Gerasimenko (67P) --
arxiv +1 more source
Molecules, 2014 Diastereoselective reactions between 4-formylpyrazoles, N-substituted maleimides and glycine derivates led to new series of pyrazolyldipyrrolo [3,4-a:3',4'-f]pyrrolizines and pyrazolylpyrrolo[3,4-c]pyrroles in good yields.
Jairo Quiroga +6 more
doaj +1 more source
Synthesis of New Oxindoles and Determination of Their Antibacterial Properties
Heteroatom Chemistry, 2020 A versatile method for the synthesis of new oxindoles was developed by the reaction between substituted isatins and 5-aminopyrazoles. The reaction was carried out at room temperature in ethanol using p-toluenesulfonic acid as the catalyst.
Pablo E. Romo +4 more
doaj +1 more source
Traceless Redox-Annulations of Alicyclic Amines
SynOpen, 2020 Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with ortho-(nitromethyl)benzaldehyde. Benzoic acid acts as a promoter in these reactions, which involve concurrent amine α-C–H bond and N–H bond functionalization ...
Dillon R. L. Rickertsen +4 more
doaj +1 more source