نتایج جستجو برای: rhodium

تعداد نتایج: 4139  

2001
Tamio Hayashi

Asymmetric 1,4-arylation and -alkenylation was achieved by use of organoboronic acids or their derivatives in the presence of a rhodium catalyst coordinated with binap ligand. The reaction conditions are unique in that it is usually carried out in an aqueous solvent at 100 °C. The scope of this asymmetric addition is very broad, a,b-unsaturated ketones, esters, 1-alkenylphosphonates, and 1-nitr...

Journal: :Organic letters 2016
Robert W Kubiak Jeffrey D Mighion Sidney M Wilkerson-Hill Joshua S Alford Tetsushi Yoshidomi Huw M L Davies

The enantioselective intermolecular sp(3) C-H functionalization at the allylic and benzylic positions was achieved using rhodium-catalyzed reactions with 4-phenyl-N-(methanesulfonyl)-1,2,3-triazole. The optimum dirhodium tetracarboxylate catalyst for these reactions was Rh2(S-NTTL)4. The rhodium-bound α-imino carbene intermediates preferentially reacted with tertiary over primary C-H bonds in g...

2013
D. Atzei

Dilute aqueous solutions of Rhodium (III) at the Cl~/Rh(III) ratios 4.86 and 10.7 have been X-ray examined. Octahedral R h ( H 2 0 ) ^ + and Rh(H 2 0) 3 Cl 3 complexes are the species which are consistent with the correlation functions and the structure functions. The average number of bonded chloride ions per Rhodium atom has been determined and the reliability of the structural information is...

2017
Christophe Rebreyend Yann Gloaguen Martin Lutz Jarl Ivar van der Vlugt Inke Siewert Sven Schneider Bas de Bruin

One-electron oxidation of the rhodium(I) azido complex [Rh(N3 )(PNP)] (5), bearing the neutral, pyridine-based PNP ligand 2,6-bis(di-tert-butylphosphinomethyl)pyridine, leads to instantaneous and selective formation of the mononuclear rhodium(I) dinitrogen complex [Rh(N2 )(PNP)]+ (9+ ). Interestingly, complex 5 also acts as a catalyst for electrochemical N3- oxidation (Ep ≈-0.23 V vs. Fc+/0 ) i...

2016
Weiming Yuan Lars Eriksson Kálmán J. Szabó

A new reaction for the rhodium-catalyzed geminal-difunctionalization-based fluorination is presented. The substrates are aromatic and aliphatic diazocarbonyl compounds. As the fluorine source a stable and easily accessible benziodoxole reagent was used. A variety of alcohol, phenol, and carboxylic acid reagents were employed to introduce the second functionality. The reaction was extended to tr...

Journal: :Inorganic chemistry 2004
Elton L Menon Rushika Perera Maribel Navarro Richard J Kuhn Harry Morrison

An octahedral rhodium complex (cis-dichloro(dipyrido[3,2a-2',3'c]phenazine)(1,10-phenanthroline)rhodium(III) chloride; DPPZPHEN) has been prepared that can penetrate tumor cell membranes and the Sindbis viral capsid. The compound is phototoxic to these entities when irradiated with UVA light. Model studies with calf thymus and supercoiled plasmid DNA indicate that the complex can both bind with...

2017
Xiaohui Zhao Xianguai Liang Shuwen Jiang Wanli Zhang Hongchuan Jiang

Due to their small size, extremely fast response, and low cost, refractory metallic thin film thermocouples (TFTCs) are well suited for the surface temperature measurement of hot components. In this study, PtRh films with different amounts of Rhodium (10% and 13%) were deposited with direct current magnetron sputtering and annealed at different temperatures in air. The chemistry, microstructure...

Journal: :Angewandte Chemie 2015
Ana M Geer Ángel L Serrano Bas de Bruin Miguel A Ciriano Cristina Tejel

Complexes with terminal phosphanido (M-PR2) functionalities are believed to be crucial intermediates in new catalytic processes involving the formation of P-P and P-C bonds. We showcase here the isolation and characterization of mononuclear phosphanide rhodium complexes ([RhTp(H)(PR2)L]) that result from the oxidative addition of secondary phosphanes, a reaction that was also explored computati...

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2005
Oliver R Inderwildi Dirk Lebiedz Olaf Deutschmann Jürgen Warnatz

Density functional theory (DFT) studies were performed to investigate the influence of coadsorbates on the nitrogen oxide dissociation on the vicinal rhodium(311) surface. This study amplifies prior studies on the dissociation of oxygen and nitrogen oxide on the (111) facet of rhodium. The influence of coadsorbates on the kinetic parameters and thermochemistry of the NO dissociation on Rh311 wa...

2004
K. Bergamaski J. F. Gomes B. E Goi F. C. Nart Ernesto Rafael Gonzalez

The electrochemical oxidation on platinum and platinum rhodium bimetallic electrodes was studied by Differential Electrochemical Mass Spectrometry for several ethanol concentrations in solution. It is found that increasing the ethanol concentration the production of the partially oxidized products (acetaldehyde) increases as the concentration increases. On the other hand, addition of 25% at. of...

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