scholarly journals Thiol-Functionalized Ethylene Periodic Mesoporous Organosilica as an Efficient Scavenger for Palladium: Confirming the Homogeneous Character of the Suzuki Reaction

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 623 ◽  
Author(s):  
María I. López ◽  
Dolores Esquivel ◽  
César Jiménez-Sanchidrián ◽  
Pascal Van Der Voort ◽  
Francisco J. Romero-Salguero
Keyword(s):  
Phenylboronic Acid ◽  
Suzuki Reaction ◽  
Coupling Reaction ◽  
Deep Insight ◽  
Periodic Mesoporous Organosilica ◽  
Mesoporous Organosilica ◽  
Cross Coupling Reaction ◽  
Mesoporous Organosilicas ◽  
Insight Into ◽  
Catch Mechanism

This work describes the synthesis of thiol-functionalized periodic mesoporous organosilicas (PMOs) prepared using the precursor 1-thiol-1,2-bis(triethoxysilyl)ethane, alone or mixed with 1,2-bis(triethoxysilyl)ethane. The thiol groups incorporated into the structure were found to be efficient for palladium binding. This has allowed these materials to be used as catalysts in the Suzuki cross-coupling reaction of bromobenzene and phenylboronic acid. Their performance has been compared to palladium-supported periodic mesoporous (organo)silicas and important differences have been observed between them. The use of different heterogeneity tests, such as hot filtration test and poisoning experiments, has provided a deep insight into the reaction mechanism and has confirmed that the reaction occurs in the homogeneous phase following a “release and catch” mechanism. Furthermore, the thiol-functionalized periodic mesoporous organosilica, synthesized using only 1-thiol-1,2-bis(triethoxysilyl)ethane as a precursor, has proven to be an efficient palladium scavenger.

scholarly journals POSSIBILITY OF PECTIN APPLICATION FOR THE DEVELOPMENT OF SUZUKI REACTION CATALYSTS

2020 ◽  
pp. 26-30
Author(s):  
Полина Михайловна Рассказова ◽  
Линда Жановна Никошвили
Keyword(s):  
Catalytic Properties ◽  
Ambient Pressure ◽  
Phenylboronic Acid ◽  
Suzuki Reaction ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Water Mixture ◽  
Batch Mode ◽  
Modified Alumina ◽  
Cross Coupling Reaction

Работа посвящена синтезу Pd-содержащих катализаторов на основе пектина и исследованию их каталитических свойств в реакции кросс-сочетания Сузуки. Была синтезирована серия катализаторов на основе пектина при варьировании способа осаждения металла. Катализаторы были протестированы в реакции кросс-сочетания между 4-броманизолом и фенилбороновой кислотой в периодическом режиме при атмосферном давлении в смеси этанола и воды с использованием NaCO в качестве основания. Показано, что наибольшей активностью обладает катализатор Pd/(пектин-AlO), в ходе приготовления которого палладий наносился на модифицированный пектином оксид алюминия (конверсия 4-броманизола за 3 ч составила 90%). This work is devoted to the synthesis of Pd-containing catalysts based on pectin and study of their catalytic properties in the Suzuki cross-coupling reaction. A series of catalysts based on pectin was synthesized by varying the method of metal deposition. The catalysts were tested in cross-coupling reaction between 4-bromanisole and phenylboronic acid in a batch mode at ambient pressure in ethanol-water mixture using NaCO as a base. It was shown that the catalyst Pd/(pectin-AlO), which was synthesized via deposition of palladium on pectin-modified alumina, revealed highest activity (conversion of 4-bromanisole for 3 h of reaction reached 90%).

scholarly journals Palladium Comprising Dicationic Bipyridinium Supported Periodic Mesoporous Organosilica (PMO): Pd@Bipy–PMO as an Efficient Hybrid Catalyst for Suzuki–Miyaura Cross-Coupling Reaction in Water

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 140 ◽  
Author(s):  
Arefeh Ahadi ◽  
Sadegh Rostamnia ◽  
Paria Panahi ◽  
Lee Wilson ◽  
Qingshan Kong ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Coupling Reaction ◽  
Catalytic Efficiency ◽  
Nitrogen Adsorption ◽  
Diffraction Field ◽  
Coupling Reactions ◽  
Hybrid Catalyst ◽  
Periodic Mesoporous Organosilica ◽  
Mesoporous Organosilica ◽  
Cross Coupling Reaction

In this study, we developed a novel catalysts consisting of periodic mesoporous organosilica functionalized with bipyridinium ionic liquid supported palladium. The physiochemical properties of the hybrid catalyst were investigated using Fourier transform infrared spectroscopy, small angle X–ray powder diffraction, field emission scanning electron microscope, transmission electron microscope, nitrogen adsorption–desorption analyses, and atomic absorption spectroscopy. The stabilized Pd species inside the mesochannels provided good catalytic efficiency for the Suzuki–Miyaura coupling reactions in water. The activity of the designed catalysts retained for several consecutive recycle runs. The stability, recoverability, and reusability of the designed heterogeneous catalyst were also studied under various reaction conditions.

scholarly journals Flow Process Development and Optimization of A Suzuki-Miyaura Cross Coupling Reaction using Response Surface Methodology

2020 ◽  
Vol 15 (3) ◽  
pp. 604-616
Author(s):  
Girish Basavaraju ◽  
Ravishankar Rajanna
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Flow Reactor ◽  
Phenylboronic Acid ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Flow Process ◽  
Cross Coupling Reaction ◽  
Custom Made ◽  
Good Agreement

A custom-made tubular flow reactor was utilized to develop a mathematical model and optimize the Suzuki-Miyaura cross coupling reaction. In this study, the experimentation was designed and executed through the statistical design of experiments (DoE) approach via response surface methodology. The effect of molar ratios of phenylboronic acid (1) and 4-bromophenol (2), temperature, the catalyst tetrakis(triphenylphosphine)palladium, and equivalence of aqueous tripotassium phosphate was studied in detail. The flow reactor profile was in good agreement with batch conditions and significant improvements to the overall reaction time and selectivity towards desired [1-1-biphenyl]-4-ol (3) was achieved. The Suzuki coupling reaction in batch condition would take on an average of 4 to 6 hours to complete, which was effectively accomplished in 60 to 70 minutes in this tubular reactor setup and could be operated continuously. The reaction model is in good agreement with the reaction conditions. Copyright © 2020 BCREC Group. All rights reserved 

scholarly journals Light-Emitting Lanthanide Periodic Mesoporous Organosilica (PMO) Hybrid Materials

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 566 ◽  
Author(s):  
Anna M. Kaczmarek ◽  
Pascal Van Der Voort
Keyword(s):  
Hybrid Materials ◽  
Mechanical Stability ◽  
Mesoporous Structure ◽  
Exciting Light ◽  
Periodic Mesoporous Organosilica ◽  
Light Emitting ◽  
Mesoporous Organosilica ◽  
Wide Range ◽  
Optical Applications ◽  
Mesoporous Organosilicas

Periodic mesoporous organosilicas (PMOs) have a well ordered mesoporous structure, a high thermal and mechanical stability and a uniform distribution of organic functionalities in the pore walls. The organic groups allow PMOs to be modified and functionalized by using a wide range of organic reactions. Since their first report in 1999, PMOs have found a vast range of applications, such as for catalysis, adsorbents, low-k films, biomedical supports and also for optical applications. Optical applications are very interesting as PMOs offer the possibility of designing advanced luminescent hybrid materials comprising of organic components, yet with much higher stability and very good processability. Despite their promising possibilities, the optical properties of pristine PMOs and PMOs grafted with d-metal or f-metal ions and complexes have been explored less frequently. In this review, we aimed to overview the exciting light emitting properties of various reported lanthanide PMO hybrid materials and interest the reader in this promising application for lanthanide PMO materials.

scholarly journals Site-isolated manganese carbonyl on bipyridine-functionalities of periodic mesoporous organosilicas: efficient CO2 photoreduction and detection of key reaction intermediates

2017 ◽  
Vol 8 (12) ◽  
pp. 8204-8213 ◽  
Author(s):  
Xia Wang ◽  
Indre Thiel ◽  
Alexey Fedorov ◽  
Christophe Copéret ◽  
Victor Mougel ◽  
...  
Keyword(s):  
Reaction Intermediates ◽  
Periodic Mesoporous Organosilica ◽  
Co2 Photoreduction ◽  
Periodic Mesoporous Organosilicas ◽  
Highly Active ◽  
Mesoporous Organosilica ◽  
Manganese Catalysts ◽  
Mesoporous Organosilicas ◽  
Manganese Carbonyl

Robust heterogeneous bipyridine-based periodic mesoporous organosilica manganese catalysts are highly active for CO2 photoreduction.

Investigation on the function of nonionic surfactants during compressed CO2-mediated periodic mesoporous organosilica formation

Soft Matter ◽  
2017 ◽  
Vol 13 (34) ◽  
pp. 5704-5713 ◽  
Author(s):  
Cheng Wang ◽  
Mengnan Zhang ◽  
Wei Li ◽  
Xin Huang ◽  
Shuang Li ◽  
...  
Keyword(s):  
Systematic Study ◽  
Nonionic Surfactants ◽  
Periodic Mesoporous Organosilica ◽  
Periodic Mesoporous Organosilicas ◽  
Mesoporous Organosilica ◽  
Mesoporous Organosilicas

A systematic study on the formation of periodic mesoporous organosilicas by using different nonionic surfactants as templates with compressed CO2.

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