-nitro type reagents have been demonstrated as mild nitration tools in recent years. This work presents an exploration of direct nitration of aryl alkenes mediated by DNDMH, a novel -nitro type reagent developed in our previous study. It exhibits herein a new property of DNDMH as an effective direct nitration reagent for aryl alkenes, through probably the delivery of nitro radicals with the aid of TEMPO and Cu(OAc).
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http://dx.doi.org/10.1039/d3cc06275a | DOI Listing |
J Org Chem
November 2024
Pharmacy College, Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, China.
A route for nitrification and C-H activation/cyclization of ()--allyl-'-benzylidenebenzenesulfonohydrazide and cobalt nitrate via an iron(II)-catalyzed cascade reaction to synthesize nitrated dihydropyrazoles has been developed. The method features convenient operation and good functional group tolerance. In addition, it employs insensitive and inexpensive FeSO as the catalyst and provides a direct approach for the preparation of dihydropyrazoles.
View Article and Find Full Text PDFEnviron Sci Technol
November 2024
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Climate change has resulted in increased use of pesticides and fertilizers in agriculture, leading to elevated pesticide and nitrate levels in aquatic ecosystems that receive agricultural runoff. In this study, we demonstrate that far-UVC (UV) photolysis of nitrate rapidly degrades four pesticides in surface water, with a degradation rate constant 37.1-144.
View Article and Find Full Text PDFChemistry
December 2024
Department of Chemistry, Biochemistry, and Pharmaceutical Sciences, University of Bern (UniBe), Freiestrasse 3, 3012, Bern, Switzerland.
The evolution of catalysis and functional group transfer reagents play a significant role in the development of anti-Markovnikov alkene hydrofunctionalization reactions, facilitating the access to value-added molecules. We herein report the first rational design of a modular intermolecular anti-Markovnikov hydronitration of alkenes, enabling the direct synthesis of terminal nitroalkanes under visible light-mediated photoredox catalysis. By employing the redox-active organic nitrating reagent N-nitrosuccinimide, the produced nitryl radicals, in the presence of an olefin and a hydrogen atom transfer (HAT) mediator, lead to an anti-Markovnikov addition with complete regioselectivity.
View Article and Find Full Text PDFJ Environ Manage
November 2024
National and Local Joint Engineering Research Center for Ecological Treatment Technology of Urban Water Pollution, College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China. Electronic address:
Org Lett
September 2024
Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
In the realm of organic synthesis, direct C-H alkynylation with arylacetylenes has remained a daunting challenge due to competing annulations or alkenylation. Addressing this long-standing issue, herein we demonstrate the merging of copper and photocatalysis to achieve the elusive C-H alkynylation of benzamides using arylacetylenes or arylpropiolic acids. Unlike conventional copper-mediated C-H activations, our protocol circumvents the need for high temperatures and stoichiometric amounts of copper salts or metal/non-metal oxidants.
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