نتایج جستجو برای: electron withdrawing

تعداد نتایج: 310077  

Journal: :Chemical communications 2010
Yue Ma Gong-Feng Xu Xi Yang Li-Cun Li Jinkui Tang Shi-Ping Yan Peng Cheng Dai-Zheng Liao

Utilization of the strong electron-withdrawing ligand, hfac, leads to a novel dinuclear dysprosium single-molecule magnet featuring a pyrazine bridge with a large anisotropic barrier.

Journal: :Chemical & Pharmaceutical Bulletin 2021

The coumarin skeleton has been a focus of attention for many years, and its fluorescence properties vary depending on the substituents. Fluorescent derivatives are useful tools strategies have developed their synthesis. Although 7-diethylaminocoumarin excellent properties, it is unstable. We facile strategy synthesis by increasing electrophilicity ynone moiety to promote nucleophilic addition r...

Cancer is a big global problem and is one of the top and main causes of mortality in developed countries. Many of the current treatments and anticancer therapeutics have problems with severe side effects and on the other hand, the drug resistance is also another obstacle in the cancer chemotherapy. Hence, there is a strong demand for the discovery and development of effective new antineopla...

5-Substituted-1H-tetrazoles were synthesized by the [3 + 2] cycloaddition of sodium azide with various nitriles in the presence of nickel zirconium phosphate (NiZrP) as an effective heterogeneous catalyst in dimethylsulfoxide at 120 °C. This method has the advantages of good to high yields, simple methodology and easy work-up. The catalyst can be recovered by centrifuging and reused with good y...

Journal: :Journal of colloid and interface science 2003
Walton J Cabrera Marcela Urzúa Hernán E Ríos

The effect of phenols containing different electron-withdrawing substituents on the potentiometric responses of several liquid PVC membranes containing the complex trioctylmethylammonium-nitrate, TOMA(+)NO(3)(-), is analyzed. The results make it possible to separate these phenols into two groups; those phenols containing electron-releasing groups, which produce almost Nernstian slopes, and thos...

Journal: :Organic & biomolecular chemistry 2007
Sushma Manda Ikuo Nakanishi Kei Ohkubo Haruko Yakumaru Ken-ichiro Matsumoto Toshihiko Ozawa Nobuo Ikota Shunichi Fukuzumi Kazunori Anzai

Comparative study of electrochemical redox behaviour of five different nitroxyl radicals leads to the direct correlation between one-electron redox potentials and group electronegativity of the beta-substituent on the ring. Beta-substituents with an electron-donating effect caused a negative shift in the one-electron oxidation and one-electron reduction potentials of the nitroxyl radicals. In a...

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