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Mechanism of Alkyne Hydroarylation Catalyzed by (P,C)-Cyclometalated Au(III) Complexes.
J Am Chem Soc
December 2022
Laboratoire Hétérochimie Fondamentale et Appliquée - LHFA UMR 5069, CNRS/Université de Toulouse, UPS, 118 route de Narbonne, 31062 Toulouse Cedex 09, France.
Over the last 5-10 years, gold(III) catalysis has developed rapidly. It often shows complementary if not unique features compared to gold(I) catalysis. While recent work has enabled major synthetic progress in terms of scope and efficiency, very little is yet known about the mechanism of Au(III)-catalyzed transformations and the relevant key intermediates have rarely been authenticated.
View Article and Find Full Text PDFOH-initiated degradation of 1,2,3-trimethylbenzene in the atmosphere and wastewater: Mechanisms, kinetics, and ecotoxicity.
Sci Total Environ
January 2023
School of Environmental and Municipal Engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, Shandong 266033, PR China. Electronic address:
1,2,3-Trimethylbenzene (1,2,3-TMB) is an important volatile organic compound (VOC) present in petroleum wastewater and the atmosphere. This compound can be degraded by OH radicals via abstraction, addition and substitution mechanisms. Results show that the addition mechanism is dominant and H-abstraction is subdominant, while methyl abstraction and substitution mechanisms are negligible in the gas and aqueous phases.
View Article and Find Full Text PDFMetalloenzyme-Inspired Ce-MOF Catalyst for Oxidative Halogenation Reactions.
ACS Appl Mater Interfaces
July 2021
Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Cientificas, Av. de los Naranjos, s/n, 46022 Valencia, Spain.
The structure of UiO-66(Ce) is formed by CeO defective nanoclusters connected by terephthalate ligands. The initial presence of accessible Ce sites in the as-synthesized UiO-66(Ce) has been determined by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR)-CO analyses. Moreover, linear scan voltammetric measurements reveal a reversible Ce/Ce interconversion within the UiO-66(Ce) material, while nanocrystalline ceria shows an irreversible voltammetric response.
View Article and Find Full Text PDFMetal-free Transformations of Nitrogen-Oxyanions to Ammonia via Oxoammonium Salt.
Angew Chem Int Ed Engl
September 2021
School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram, 695551, India.
Transformations of nitrogen-oxyanions (NO ) to ammonia impart pivotal roles in sustainable biogeochemical processes. While metal-mediated reductions of NO are relatively well known, this report illustrates proton-assisted transformations of NO anions in the presence of electron-rich aromatics such as 1,3,5-trimethoxybenzene (TMB-H, 1 a) leading to the formation of diaryl oxoammonium salt [(TMB) N =O][NO ] (2 a) via the intermediacy of nitrosonium cation (NO ). Detailed characterizations including UV/Vis, multinuclear NMR, FT-IR, HRMS, X-ray analyses on a set of closely related metastable diaryl oxoammonium [Ar N =O] species disclose unambiguous structural and spectroscopic signatures.
View Article and Find Full Text PDFMicrocystin-LR degradation kinetics during chlorination: Role of water quality conditions.
Water Res
October 2020
Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, 2070 Neil Ave, Columbus, OH 43210, United States.
Microcystin-LR (MCLR) produced during certain cyanobacteria blooms can contaminate drinking water sources and pose a threat to public health. Previous studies of MCLR degradation by free chlorine may have artifacts from using strong reducing agents to quench chlorination reactions, and they also have not explored the influence of water quality characteristics such as pH, alkalinity, temperature and dissolved organic matter (DOM). Using a novel quencher, 1,3,5-trimethoxybenzene (TMB), the apparent MCLR degradation rate constants were found to be higher than those obtained with thiosulfate (SO), a traditionally used strong reducing quencher.
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