Results 201 to 210 of about 358,569 (255)

The synthetic potential of pyridinium salt photochemistry

Photochemical & Photobiological Sciences, 2008
The discovery in the 1970s by Kaplan, Wilzbach and Pavlik that pyridinium salts undergo a unique cyclization reaction to produce bicyclic-aziridines was virtually unrecognized for nearly three decades. It was only comparatively recently that the process was explored in more detail and its synthetic potential exploited.
Jiwen, Zou, Patrick S, Mariano
openaire   +2 more sources

Infrared spectra of pyridinium salts in solution—III. Associations of pyridinium salts with bases

Spectrochimica Acta Part A: Molecular Spectroscopy, 1983
Associations of pyridinium salts X-Py+HA− (A− = SbCl−6, ClO−4, BF−4, I−, Br− and Cl−) with a wide series of aprotic bases and with protic solvents (water and fluoroalcohols) have been studied by infrared spectroscopic methods. Constants of association Ka of the pyridinium salts with the bases at different temperatures have been measured and enthalpy ...
S.E. Odinokov, A.A. Mashkovsky, A.A. Nabiullin   +2 more
openaire   +1 more source

Synthesis of Indolizines from Pyridinium Salts and Ethyl Bromodifluoroacetate.

Organic Letters, 2020
Here we present a novel annulation of pyridinium salts with BrCF2CO2Et to access the indolizine derivatives with high efficiency. The α substitution of pyridine plays a key role in determining the reaction pathways.
X. Hou, Senxian Zhou, Yuli Li, M. Guo, Wentao Zhao, Xiangyang Tang, Guangwei Wang   +6 more
semanticscholar   +1 more source

Photoinduced Multicomponent Heteroarylation of [1.1.1]Propellane with Katritzky Pyridinium Salts.

Organic Letters
(Hetero)arylated bicyclo[1.1.1]pentanes (BCPs) are important for the construction of complex druglike target molecules. Herein, we developed a method for light-induced, Cs2CO3-promoted homolytic cleavage of pyridinium C-N bonds for generating alkyl ...
Yulin Xiao, Jianyang Dong, Yuying Wang, Huijuan Liao, Jiayi Dang, Gang Li, Dong Xue   +6 more
semanticscholar   +1 more source

Stereodivergent Synthesis of Alkenylpyridines via Pd/Cu Catalyzed C-H Alkenylation of Pyridinium Salts with Alkynes.

Organic Letters, 2020
The first Pd/Cu catalyzed selective C2-alkenylation of pyridines with internal alkynes has been developed via the pyridinium salt activation strategy.
Wen-jing Li, Juan Tang, Shun Li, Xue-li Zheng, M. Yuan, Bin Xu, Weidong Jiang, H. Fu, Ruixiang Li, Hua Chen   +9 more
semanticscholar   +1 more source

Design, synthesis and bactericidal activity of novel coumarin derivatives containing pyridinium salts.

Pesticide Biochemistry and Physiology
Coumarin is a natural product known for its diverse biological activities. While its antifungal properties in agricultural chemistry have been extensively studied, there is limited research on its antibacterial potential.
Xin Wang, Ting Liu, Ronghua Wang, Tangbing Yang, Qiu Liu, Baoan Song   +5 more
semanticscholar   +1 more source

Isolable Pyridinium Trifluoromethoxide Salt for Nucleophilic Trifluoromethoxylation

Organic Letters, 2021
An isolable pyridinium trifluoromethoxide salt is prepared from the reaction of 4-dimethylaminopyridine with the commercially available liquid 2,4-dinitro(trifluoromethoxy)benzene. The salt is an effective trifluoromethoxide source for SN2 reactions to form trifluoromethyl ethers.
Geraldo Duran-Camacho, Devin M. Ferguson, Jeff W. Kampf, Douglas C. Bland, Melanie S. Sanford   +4 more
openaire   +2 more sources

Antimycobacterial Activity of Quaternary Pyridinium Salts and Pyridinium N-oxides - Review

Current Pharmaceutical Design, 2012
The treatment of tuberculosis and other mycobacterioses is still a major world health problem and new antimycobacterial compounds unrelated to approved drugs are in demand. Quaternary ammonium salts have revealed many usable properties especially as antimicrobials; they are widely used as disinfection and antiseptic agents.
Martin, Krátký, Jarmila, Vinšová
openaire   +2 more sources

Energy-saving and long-life electrochromic materials of naphthalene diimide-cored pyridinium salts

, 2020
Developing electrochromic materials with energy-saving (i.e., low driving voltage) and long-life (i.e., high switching stability) properties is highly desirable with respect to practical application. In this work, we report the synthesis of two N,N′-di(4-
Feng Li, Zhen-jie Huang, Qian Zhou, Ming-yue Pan, Qian Tang, Cheng-bin Gong   +5 more
semanticscholar   +1 more source

Nickel-Catalyzed Cross-Coupling of Alkyl Carboxylic Acid Derivatives with Pyridinium Salts via C-N Bond Cleavage.

Organic Letters, 2020
The electrophile-electrophile cross-coupling of carboxylic acid derivatives and alkylpyridinium salts via C-N bond cleavage is developed. The method is distinguished by its simplicity and steers us through a variety of functionalized ketones in good to ...
Feba Thomas Pulikottil, Ramadevi Pilli, Rohith Valavil Suku, R. Rasappan   +3 more
semanticscholar   +1 more source