A statistically significant rise in the frequency of chronic atrophic gastritis, a precursor of cancer, has been identified in subjects exposed to monocyclic aromatic carbohydrates.
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α/β Conflicting Aromaticity Under the Microscope: Study of Pro-Aromatic Radicals.
Chemphyschem
January 2025
University of Vigo, Dept. of Physical Chemistry, Lagoas-Marcosende, 36310, Vigo, SPAIN.
The aromaticity of a representative sample of pro-aromatic radicals and its nitro, amino, hydroxyl and imine substituted derivatives has been analysed by means of multicentre delocalization indices (MCI) and nuclear-independent chemical shifts (NICS). Because of their radical character, these compounds may exhibit conflicting α/ß aromaticity, so that the contribution of α and β electrons to the MCI and NICS has been analysed separately and their values qualitatively interpreted in terms of the 2n+1/2n rule. All the monocyclic radicals investigated show conflicting α/β aromaticity.
View Article and Find Full Text PDFIsolation of a planar π-aromatic Bi ring in a cobalt-based inverse-sandwich-type complex.
Nat Chem
January 2025
Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Monocyclic π-aromatic compounds are ubiquitous throughout almost all fields of natural sciences-as synthons in industrial processes, as ligands of metal complexes for catalysis or sensing and as bioactive molecules. Planar organocycles stand out through their specific way of overcoming electron deficiency by a non-localizable set of (4n + 2)π electrons. By contrast, all-metal aromatic monocycles are still rare, as metal atoms prefer to form clusters with multiply bonded atoms instead.
View Article and Find Full Text PDFA Straightforward Synthetic Route to Monocyclic 1,3,2,4-Diazadiborinines.
Inorg Chem
January 2025
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China.
A novel straightforward synthetic route to monocyclic 1,3,2,4-diazadiborinines has been developed by the sequential reaction of the NHC-coordinated iminoborane with bases and haloboranes (or borate). The first examples of monocyclic 1,3,2,4-diazadiborinines featuring different functional groups on the two B atoms have been synthesized and structurally characterized. Further derivatization of 4-bromophenyl-substituted 1,3,2,4-diazadiborinine has also been achieved, giving the biphenyl-substituted 1,3,2,4-diazadiborinine.
View Article and Find Full Text PDFSpectral fingerprints of DOM-tungsten interactions: Linking molecular binding to conformational changes.
J Hazard Mater
February 2025
College of Environment & Ecology, Hunan Agricultural University, Changsha 410127, China. Electronic address:
Tungsten (W), a widely used yet understudied emerging contaminant, forms oxyanions in aqueous environments, distinguishing it from conventional heavy metals. While dissolved organic matter (DOM) demonstrates considerable potential for W binding, DOM-W interactions remain largely unexplored. Of particular significance, yet frequently overlooked, are the conformational changes in DOM during W binding processes.
View Article and Find Full Text PDFProduction of aromatic hydrocarbons from catalytic fast pyrolysis of microalgae over Fe-modified HZSM-5 catalysts.
RSC Adv
November 2024
School of Energy Materials and Chemical Engineering, Hefei University Hefei 230601 China.
Article Synopsis
- The study investigates the catalytic fast pyrolysis of microalgae using Fe-modified HZSM-5 catalysts to produce aromatic hydrocarbons, analyzed through Py-GC/MS.
- Various Fe loadings (3-12 wt%) and pyrolysis temperatures (450-600 °C) were tested, revealing that an 8 wt% Fe loading at 500 °C yielded the highest aromatic hydrocarbon content at 42.5%.
- The modification with Fe improved the catalyst properties by increasing the total acid amount, enhancing the production of monocyclic aromatic hydrocarbons while reducing unwanted compounds like polycyclic aromatic hydrocarbons.
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