Proline-functionalized chitosan–palladium( ii ) complex, a novel nanocatalyst for C–C bond formation in water

Mohammadsaleh

2015

aIn the presence of amino acids as environmentally friendly ligands, CuI-catalyzed Sonogashira cross-coupling of various aryl halides with phenylacetylene was conducted to afford the corresponding internal alkynes. L-Methionine was found to be useful for this palladium-free and amine-free coupling reaction. It was also found that the solvent system plays an important role in this reaction, and significantly affects the product formation and reaction rate. Sonogashira coupling of aryl iodides and aryl bromides in dimethylsulfoxide or dimethylformamide gave the coupled products in good to excellent yields.

Section: Introductionmentioning

confidence: 99%

Methionine: a green and efficient promoter for copper‐catalyzed Sonogashira cross‐coupling reactions

Mohammadsaleh

2015

“…[40][41][42] We have also reported the investigation of a series of nicotinebased ammonium salts as catalysts for chemical fixation of carbon dioxide into cyclic carbonates, and it was found that monobenzylnicotinium bromide showed a much higher activity than dibenzylnicotinium bromide. [43] In continuation of our recent studies on the development of eco-friendly catalytic protocols, [44,45] herein, we report the synthesis and characterization of a nicotine-functionalized silica supported Pd complex as a recyclable solid catalyst. This new catalyst system having a synergistic effect of coordination and electrostatic interactions was found to be efficient in palladium-catalyzed C-C bond formation.…”

Section: Introductionmentioning

confidence: 90%

“…In continuation of our recent studies on the development of eco‐friendly catalytic protocols, herein, we report the synthesis and characterization of a nicotine‐functionalized silica supported Pd complex as a recyclable solid catalyst. This new catalyst system having a synergistic effect of coordination and electrostatic interactions was found to be efficient in palladium‐catalyzed C‐C bond formation.…”

Section: Introductionmentioning

confidence: 99%

Nicotine functionalized‐silica palladium (II) complex: a highly efficient, environmentally benign and recyclable nanocatalyst for C‐C bond forming reactions under mild conditions

Tadayoni

Mohammadsaleh

2016

An environmentally friendly silica‐grafted nicotine‐based palladium(II) complex was successfully prepared and evaluated for the first time as novel and efficient nanocatalyst in C‐C bond forming reactions. Grafted‐nicotine in this catalytic system plays an important role, and as an effective ligand and a quaternary ammonium salt demonstrates an efficient stabilizing effect on the Pd(II) species by a synergistic effect of coordination and electrostatic interactions. The catalyst was well characterized by FT‐IR, CHN, XRD, TEM, SEM–EDX, ICP and TG analysis, and demonstrated a highly efficient catalytic activity in the reaction system under phosphine‐free and low Pd loading conditions, and the coupled products were produced in good to excellent yields. Furthermore, the catalyst can be easily recovered and reused without a significant loss of activity. Copyright © 2016 John Wiley & Sons, Ltd.

“…To overcome these problems, immobilization of homogeneous metal catalysts by anchoring on various substrates, such as polymers, silica, zeolites and carbon nanotubes can be used for minimizing toxic species from chemical processes. These substrates facilitate work‐up of the reaction and recycling of the catalyst, which recently have been introduced as an important research field to achieve green catalyst systems.…”

Section: Introductionmentioning

confidence: 99%

Copper nanoparticles supported on 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41: An efficient and recyclable catalyst for one‐pot three‐component C–S coupling reaction of aryl halides with benzyl bromide and thiourea

Fakhari

Bidhendi

2019

An environmentally friendly copper‐based catalyst supported on 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41 was prepared and characterized by Fourier transform‐infrared, transmission electron microscopy, field emission‐scanning electron microscopy, X‐ray diffraction and inductively coupled plasma techniques. The catalyst was applied for the one‐pot three‐component C–S coupling reactions of aryl halides with benzyl bromide and thiourea under aerobic conditions to afford the corresponding coupled products in good yields in water. The catalyst could be recovered and recycled five times. These results prove 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41 supported Cu (II) complex was not leached during the reaction. Also it shows the correct heterogeneous nature of the catalyst.