Results 61 to 70 of about 23,422 (216)

Flash Pyrolysis – Synthetic and Mechanistic Aspects

open access: yesCHIMIA, 1977
Some examples of synthetically useful flash pyrolysis reactions are presented, and the reaction mechanisms are discussed. Cyanocyclopentadienes, -indenes, and -pyrroles are produced by pyrolysis of the appropriate triazoloarenes or isatins, or as the ...
Curt Wentrup
doaj   +1 more source

Exploring Aromaticity in Expanded Porphyrins: A Multidimensional Approach to Structure–Property Relationships

open access: yesChemistry–Methods, Volume 5, Issue 12, November 2025.
Expanded porphyrins, with their flexible structures and rich redox chemistry, offer a powerful platform to explore how aromaticity shapes molecular properties. This review introduces a multidimensional framework to quantify Hückel and Möbius aromaticity and examines its impact on the spectroscopic behavior across redox‐ and topology‐controlled expanded
Freija De Vleeschouwer   +2 more
wiley   +1 more source

2-Amino-4-(4-chlorophenyl)-5,6,7,8,9,10-hexahydrobenzo[8]annulene-1,3-dicarbonitrile

open access: yesActa Crystallographica Section E, 2012
In the title compound, C20H18ClN3, the cyclooctene ring exhibits conformational disorder of two methylene groups with a site-occupation factor of 0.859 (6) for the major occupied site.
V. Rajni Swamy   +3 more
doaj   +1 more source

Reversal of Clar's Aromatic‐Sextet Rule in Ultrashort Single‐End‐Capped [5,5] Carbon Nanotubes

open access: yesChemistryOpen, 2020
The three‐fold HOMO‐LUMO gap oscillation, typical of finite length armchair carbon nanotubes (CNT), has a major effect on the magnetic response of ultrashort, single‐end‐capped [5,5] carbon nanotubes to a perturbing magnetic field parallel to the main ...
Dr. Guglielmo Monaco   +2 more
doaj   +1 more source

Genomic and metabolomic insights into the antimicrobial compounds and plant growth-promoting potential of Bacillus velezensis Q-426

open access: yesBMC Genomics, 2023
Background The Q-426 strain isolated from compost samples has excellent antifungal activities against a variety of plant pathogens. However, the complete genome of Q-426 is still unclear, which limits the potential application of Q-426.
Lulu Wang   +14 more
doaj   +1 more source

Mott Transition in the Hubbard model

open access: yes, 1992
In this article, I discuss W.Kohn's criterion for a metal insulator transition, within the framework of a one band Hubbard model. This and related ideas are applied to 1-dimensional Hubbard systems, and some intersting miscellaneous results discussed ...
Shastry, B. Sriram
core   +1 more source

Integrative Toxicology Profiling of Thuja sutchuenensis Essential Oil: From LD50 Safety Assessment to Hepatic Apoptosis and Gut Microbiota Modulation

open access: yesFood Science &Nutrition, Volume 13, Issue 12, December 2025.
This study provides the first experimental evidence of Thuja sutchuenensis essential oil (TEO) toxicity, with an oral LD50 of ~3800 mg/kg in mice. Sub‐LD50 doses cause focal hepatic necrosis via apoptosis/oxidative stress–related pathways without systemic inflammation or renal injury.
Nana Long   +8 more
wiley   +1 more source

Optical Absorption in B$_{13}$ Cluster: A Time-Dependent Density Functional Approach

open access: yes, 2012
The linear optical absorption spectra of three isomers of planar boron cluster B$_{13}$ are calculated using time-dependent spin-polarized density functional approach.
Shinde, Ravindra, Tayade, Meenakshi
core   +1 more source

Core level binding energies of functionalized and defective graphene [PDF]

open access: yes, 2014
X-ray photoelectron spectroscopy (XPS) is a widely used tool for studying the chemical composition of materials and it is a standard technique in surface science and technology.
Ayala, Paola   +5 more
core   +5 more sources

(4Z,6Z,12Z,14Z)-2,10-Dimethyl-2,8,10,16-tetrahydrodipyrazolo[3,4-e:3′,4′-l][1,2,4,8,9,11]hexaazacyclotetradecine-4,12-diamine

open access: yesActa Crystallographica Section E, 2009
The title compound, C12H16N12, is a centrosymmetric molecule which comprises of a hexaaza[14]annulene macrocyclic ring fused with two pyrazole rings. The macrocyclic ring is essentially planar, with an r.m.s. deviation of 0.0381 Å. The
Anton V. Dolzhenko   +4 more
doaj   +1 more source

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