Miyaura
Mostrando 1-12 de 20 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. Cellulose Oxidation and the Use of Carboxyl Cellulose Metal Complexes in Heterogeneous Catalytic Systems to Promote Suzuki-Miyaura Coupling and C-O Bond Formation Reaction
This work shows the modification of microcrystalline cellulose by the selective oxidation of primary hydroxyl groups to carboxylate groups by a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated system and its application as a heterogeneous ligand by ionic exchange with catalytic metals ions such as palladium, nickel and copper. Afterwards is desc
J. Braz. Chem. Soc.. Publicado em: 2017-11
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3. Suzuki-Miyaura Coupling between 3-Iodolawsone and Arylboronic Acids. Synthesis of Lapachol Analogues with Antineoplastic and Antileishmanial Activities
A series of 2-hydroxy-3-arylnaphthalene-1,4-diones (3-aryllawsones) were synthesized by Suzuki-Miyaura cross coupling reaction of 3-iodolawsone with arylboronic acids/esters. The hydroxylated resulting products were transformed into their corresponding N,N-diethyl carbamates. The antineoplastic and antileishmanial activities of the compounds were evaluated a
J. Braz. Chem. Soc.. Publicado em: 2017-08
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4. 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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5. 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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6. EFFECTS OF SOLVENT, BASE, AND TEMPERATURE IN THE OPTIMISATION OF A NEW CATALYTIC SYSTEM FOR SONOGASHIRA CROSS-COUPLING USING NCP PINCER PALLADACYCLE
The optimisation of a new catalyst system using NCP pincer palladacycle
1 was investigated using the experimental design technique. NCP pincer palladacycle1 was previously investigated in Suzuki-Miyaura and Heck-Mizoroki cross-couplings and found to be a highly efficient catalyst precursor. In this study, the effects of the typeQuím. Nova. Publicado em: 2015-06
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7. Synthesis of Biphenyl Tyrosine Via Cross-Coupling Suzuki-Miyaura Reaction Using Aryltrifluoroborate Salts
We reported a fast and easy method for obtaining biarylic units from tyrosine derivatives via Suzuki-Miyaura cross-coupling using a variety of substituted and unsubstituted potassium aryl- and heteroaryltrifluoroborate salts. The scope of the methodology was also extended to the formation of bis-tyrosine linked dipeptide bonds, leading to biologically intere
J. Braz. Chem. Soc.. Publicado em: 2015-04
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8. 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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9. Efeito das tensões residuais sobre a propagação de trincas em juntas soldadas por FSW / Residual stress effect on crack propagation in friction stir welded joints
Inúmeros trabalhos de pesquisa tem sido feitos em torno de um processo de soldagem por atrito conhecido por FSW, ou Friction Stir Welding. A proposta deste trabalho é determinar o efeito das tensões residuais resultantes de tal processo sobre a propagação de trincas na região próxima à junta soldada. Este efeito é considerado calculando-se fatores d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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10. A compreensão é um dos níveis de leitura: experimentações e sensações - itinerários de literatura e clínica
Interface (Botucatu). Publicado em: 2012-03
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11. Acoplamento Suzuki-Miyaura: uso de glicerol para síntese de ésteres arilboronatos e como solvente, e síntese de atropoisômeros
Nesta tese a reação de Suzuki-Miyaura será abordada em três diferentes enfoques: utilização de ésteres glicerolarilboronatos, emprego de glicerol como meio reacional e síntese de atropoisômeros a partir de ligantes nitrogenados N-N¿ quirais. Primeiramente, a reação do glicerol com ácido fenilborônico proporcionou uma mistura de ésteres cíclic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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12. Funcionalização de cumarinas via reação de acoplamento de Suzuki-Miyaura de sais de organotrifluoroboratos de potássio / Functionalization of coumarins by Suzuki-Miayura cross-Coupling of potassium organotrifluoroborate salts
As cumarinas são compostos com potente atividade biológica. Foi explorada sua funcionalização, iniciando pela sua bromação, gerando o composto 3-bromocumarina, utilizado como material de partida para as reações de acoplamento do tipo Suzuki-Miyaura, que são uma das reações mais empregadas para a formação de ligação carbono-carbono, a qual util
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/04/2011