Cross Coupling Reactions
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Palladium Nanoparticles Supported on β-cyclodextrin Functionalised Poly(amido amine)s and their Application in Suzuki-Miyaura Cross-Coupling Reactions
Herein, the synthesis, characterization and catalytic application of an organic-inorganic, palladium (Pd)-containing hybrid material, poly(amidoamine)-cyclodextrin (Pd@PAAs-CD), is reported as an efficient catalyst for Suzuki-Miyaura coupling reactions. The structure of Pd@PAAs-CD was confirmed by Fourier transform infrared spectroscopy (FTIR), transmission
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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2. PdCl2 Immobilized in Polyacrylamide: a Low Cost and Eco-Friendly Catalyst for Suzuki-Miyaura Reactions
PdCl2 immobilized in polyacrylamide (PAM), named Pd/PAM, produced at an extremely low cost, was found to be an efficient catalyst for Suzuki-Miyaura cross-coupling reactions. Iodo- and bromoarenes may couple with phenylboronic acid under eco-friendly conditions (i.e., phosphine-free and with ethanol as the solvent) to give excellent product yields. Aryl chlo
J. Braz. Chem. Soc.. Publicado em: 2016-04
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3. Palladium Nanoparticles Supported on Poly(
N -vinylpyrrolidone)-Grafted Silica as an Efficient Catalyst for Copper-Free Sonogashira and Suzuki Cross-Coupling ReactionsPalladium catalyst based on polyvinylpyrrolidone-silica hybrid support was prepared and exhibited excellent activity and stability in copper, amine and phosphine-free Sonogashira-Hagihara and Suzuki-Miyaura cross-coupling reactions. The polymeric catalyst was applied efficiently in the coupling reactions of chloro (as well as iodo) and bromoarenes. Elemen
J. Braz. Chem. Soc.. Publicado em: 2015-08
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4. Recent Progress in the Use of Pd-Catalyzed C-C Cross-Coupling Reactions in the Synthesis of Pharmaceutical Compounds
A grande capacidade do paládio de formar ligações carbono-carbono entre substratos apropriadamente funcionalizados permitiu que os químicos orgânicos efetuassem transformações antes impossíveis ou alcançáveis somente através de rotas muito longas. Neste contexto, uma das mais elegantes e importantes aplicações das reações de acoplamento cruzad
J. Braz. Chem. Soc.. Publicado em: 2014-12
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5. Desenvolvimento de reator tipo "dip catalyst" para filmes poliméricos contendo nanopartículas de metais de transição
This article describes the development of a new catalytic reactor designed to operate with nanoparticle-embedded polymer thin films. Stabilization of metal nanoparticles in films that serve as catalysts in organic reactions is relatively new; therefore, the development of reactors to facilitate their use is necessary. We describe in detail the preparation of
Quím. Nova. Publicado em: 2014
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6. Aplicações sintéticas do ácido mucobrômico e da 3,4-dibromofuran-2(5H)-ona
This review describes the use of two biomass-derivate butenolides as intermediates in organic synthesis, mucobromic acid and its reduced derivative 3,4-dibromofuran-2(5H)-one. The ambiphilic and ambident character of such butenolides make them versatile starting materials in the synthesis of natural and/or bioactive compounds. Thus, the reactions of mucobrom
Química Nova. Publicado em: 2011
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7. Pd-catalyzed suzuki cross-coupling reaction of bromostilbene: insights on the nature of the boron species
Sais e ésteres derivados de ácidos aril borônicos podem ser usados na reação de acoplamento Suzuki com (E)-bromoestilbeno usando uma mistura Pd(OAc)2/PPh3 como precursor catalítico. Enquanto que a adição de uma base como KOH é necessária para a reação de acoplamento com ácido borônico ou seu éster derivado do pinacol, o uso de um aril borato d
Publicado em: 2010
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8. Copper catalyzed cross-coupling reactions of diaryl ditellurides with potassium aryltrifluoroborate salts
Apresentamos aqui resultados das reações de acoplamento de diteluretos de diarila com sais de ariltrifluoroborato de potássio, usando quantidades catalíticas de Cu(OAc)2 e bipiridina, em uma mistura de DMSO/H2O, sob ar atmosférico. Estas reações de acoplamento são gerais e são realizadas com diteluretos de diarila e sais de ariltrifluoroborato de po
Journal of the Brazilian Chemical Society. Publicado em: 2009
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9. Reações de acoplamento cruzado de organossilanos catalisadas por paládio: aspectos históricos, sintéticos e mecanísticos
The development of the palladium catalyzed cross-coupling reactions employing organosilicon compounds is described. Important synthetic methods utilized to prepare organosilicons and different types of cross-coupling reactions involving these compounds are presented. Mechanistic aspects are also discussed.
Química Nova. Publicado em: 2007
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10. Sintese e heterogeneização de complexos de paladio : aplicação em reações de acoplamento C-C / Synthesis and heterogeneization of palladium complexes : application in C-C cross-coupling reactions
In this work, palladium complexes, in which phosphored ligands are anchored to cyclophosphazenes were synthesized. These complexes, in solution or immobilized in inorganic matrices, were tested in the Suzuki cross-coupling reaction (between phenylboronic acid and bromobenzene, for example), the Stille cross-coupling reaction (between tributylvinyltin and
Publicado em: 2007
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11. SÃntese de GlicopiranosÃdeos 2,3 - insaturados acoplados a heterociclos em C-4. FuncionalizaÃÃo da posiÃÃo C-5 de glicoheterociclos 4â â (5 â halo â uracil â l â il) atravÃs de reaÃÃes catalisadas por Pd (0)
In the last years, catalytic reactions promoted by palladium(0) complexes have been successful used in some couplings reactions between carbohydrates and heterocycles compounds like nucleophiles for the synthesis of nucleosides and nucleotides with interesting antiviral and antitumor activities. During the last 20 years, palladium(0) complexes have also been
Publicado em: 2007
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12. Schematic coupled-channel calculations for nuclear reactions with unstable beams
We study nuclear reactions in collisions of unstable projectiles with heavy targets. For this purpose, we use a simple approximation for the breakup channel and treat two-neutron halos as a single particle. We then evaluate cross sections for collisions of 6He projectiles with targets of 238U and 209Bi. Comparing our results with recently measured fusion cro
Brazilian Journal of Physics. Publicado em: 2004-09