Results 51 to 60 of about 596,435 (207)

Cross-Dehydrogenative Coupling Reaction and Arylation of Quinoxalin-2(1H)-ones under Iodide/Peroxide Conditions

SynOpen, 2021
A simple method has been developed for the synthesis of ­3-(2-oxo-2-phenylethylidene)-3,4-dihydroquinoxalin-2(1H)-one and ­3-aryl-quinoxalin-2(1H)-one derivatives through C–H activation of quinoxalin-2(1H)-ones by peroxides and iodide.
Yujuan Wu, Xianglong Chu, Di Yang, Chen Ma, Caixia Xie   +4 more
doaj   +1 more source

Reactivity of Metal-Free and Metal-Associated Amyloid-?? with Glycosylated Polyphenols and Their Esterified Derivatives [PDF]

, 2015
Both amyloid-?? (A??) and transition metal ions are shown to be involved in the pathogenesis of Alzheimer???s disease (AD), though the importance of their interactions remains unclear.
A Baldisserotto, A Baldisserotto, A Rauk, AI Bush, AS DeToma, AS DeToma, AS Pithadia, B Meyer, C Hertel, CA Rice-Evans, EE Mmatli, F Yang, G Eskici, GK Gouras, H Wang, HI Ingolfsson, I Benilova, I Lampronti, IB Afanas’ev, IW Hamley, J McLaurin, JE Brown, JF Severino, K Jimenez-Aliaga, KI Priyadarsini, KP Kepp, M Kurisu, M Mayer, M Satterfield, M Yagi-Utsumi, MA Lovell, MG Savelieff, MG Savelieff, MJ Sever, MW Beck, N Schweigert, NL Fawzi, P Faller, P Faller, P Milko, P Schanda, R Franco, R Jakob-Roetne, R Re, RC Hider, RD Egleton, RD Egleton, S Lee, S Parthasarathy, S Vertuani, S Vivekanandan, SI Yoo, SJ Hyung, SS Hindo, SW Wang, V Seidel, VA Spencer, Y Porat   +57 more
core   +1 more source

Highly Efficient Synthesis of 3,3-Disubstituted Oxindoles through Direct Oxidative Alkylarylation of N-Arylacrylamides with Simple Alkanes

SynOpen, 2023
A direct oxidative alkylarylation reaction of N-arylacrylamides with simple alkanes for the synthesis of 3,3-disubstituted oxindoles under metal-free conditions was demonstrated.
Yan Chen, Weihong Song, Zhixiang Zhou, Ziye Zhang, Kai Liu, Xiaofei Zeng, Xiaoyu Han   +6 more
doaj   +1 more source

Metal-Free Dihydrogen Oxidation by a Borenium Cation:A Combined Electrochemical/Frustrated Lewis Pair Approach [PDF]

, 2014
In order to use H2 as a clean source of electricity, prohibitively rare and expensive precious metal electrocatalysts, such as Pt, are often used to overcome the large oxidative voltage required to convert H2 into 2 H+ and 2 e−. Herein, we report a metal-
Bard, Chiu, Clark, Clark, Eisenberger, Erker, Farrell, Jutzi, Lawrence, Lawrence, Matsumoto, Matsumoto, Rablen, Stephan, Ueng, Welch   +15 more
core   +1 more source

Graphitic-BN Based Metal-free Molecular Magnets From A First Principle Study

, 2005
We perform a first principle calculation on the electronic properties of carbon doped graphitic boron nitride graphitic BN. It was found that carbon substitution for either boron or nitrogen atom in graphitic BN can induce spontaneous magnetization ...
Chopra N G, G W Peng, L Liu, Ma Y, Murakami Y, Press W H, R Q Wu, Y P Feng   +7 more
core   +1 more source

Songlines from Direct Collapse Seed Black Holes: Effects of X-rays on Black Hole Growth and Stellar Populations [PDF]

, 2014
In the last decade, the growth of supermassive black holes (SMBHs) has been intricately linked to galaxy formation and evolution and is a key ingredient in the assembly of galaxies.
Aykutalp, Aycin, Meijerink, Rowin, Spaans, Marco, Wise, John H.   +3 more
core   +2 more sources

Unsymmetrical Diboron Reagents: Application in Borylation Reactions of Unsaturated Bonds

Molecules, 2019
In the past decades, borylation reactions have received extensive research interest and have developed into effective tools in the synthesis of versatile organoboron compounds. Boranes and symmetrical diboron compounds are commonly utilized as borylating
Siyi Ding, Liang Xu, Zongcheng Miao
doaj   +1 more source

Open questions in the study of population III star formation [PDF]

, 2008
The first stars were key drivers of early cosmic evolution. We review the main physical elements of the current consensus view, positing that the first stars were predominantly very massive.
A. Stacy, Bruhns, Galli, Glover, Goodwin, Goodwin, J. L. Johnson, Norman, P. C. Clark, R. S. Klessen, S. C. O. Glover, Suchkov, Suchkov, T. H. Greif, Tan, Turk, V. Bromm   +16 more
core   +1 more source

One-Pot Difunctionalization of Aryldiazonium Salts for Synthesis of para-Azophenols

Frontiers in Chemistry, 2022
A novel difunctionalization of aryldiazonium salts was realized for the one-step generation of symmetric and asymmetric p-azophenols. This approach is proceeded by the sequentially regioselective aromatic C-O and C-N bond construction under mild reaction
Zhenhua Liu, Yang Fang, Yi Liu, Wei Fu, Xingxing Gan, Wen Gao, Bo Tang   +6 more
doaj   +1 more source

Types and properties of metal-free catalysts for living polymerizations of biomaterials [PDF]

, 2008
Syntéza biokompatibilních a biodegradabilních polyesterů, použitelných převážně v medicíně, využívá pro polymeraci za otevření kruhu katalyzátory na bázi kovu (např. Sn, Al atd.), které se mohou po implantaci deponovat v těle.
Repka, Martin
core