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Publication date: July 2018Source: Comptes Rendus Chimie, Volume 21, Issue 7Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Solvent effects in the aza-Michael addition of anilines
Publication date: July 2018Source: Comptes Rendus Chimie, Volume 21, Issue 7Author(s): Alena Fedotova, Evgeniy Kondrashov, Julien Legros, Jacques Maddaluno, Alexander Yu. RulevAbstractThe aza-Michael addition of functionally substituted anilines to enoates is significantly affected by the hydrogen bond donor ability of the solvent. Very polar protic fluorinated alcohols (hexafluoroisopropanol and trifluoroethanol) favor the addition of weak nucleophiles, whereas these solvents are no longer required for anilines bearing additional OH or NH2 group.RésuméL'adition d'aza-Michael d'anilines fonctionnalisées sur des énoates...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Immobilization of palladium nanoparticles as a recyclable heterogeneous catalyst for the Suzuki–Miyaura coupling reaction
Publication date: July 2018Source: Comptes Rendus Chimie, Volume 21, Issue 7Author(s): Ramin Ghorbani-Vaghei, Narges Sarmast, Farid RahmatpourAbstractThis work describes the synthesis of Pd nanoparticles that are stabilized on CaAl-layered double hydroxide functionalized with Tris (tris(hydroxymethyl)aminomethane). The synthesized catalyst is characterized by several different analyses and has been successfully applied to the Suzuki–Miyaura reaction.Graphical abstract (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Helically chiral functionalized [6]helicene: Synthesis, optical resolution, and photophysical properties
Publication date: July 2018Source: Comptes Rendus Chimie, Volume 21, Issue 7Author(s): Nesrine Hafedh, Faouzi Aloui, Vincent Dorcet, Houcine BarhoumiAbstractA short and efficient synthetic pathway leading to a new chiral π-conjugated system is reported. The X-ray structure of the target compound was determined and showed a helical conformation. Its resolution was successfully accomplished, leading to two enantiomers in high optical purity, and their chiroptical properties were examined experimentally. The photophysical properties of the organic material were also evaluated, showing an emission in the visible region, and H...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
SiO2-functionalized melamine-pyridine group–supported Cu(OAc)2 as an efficient heterogeneous and recyclable nanocatalyst for the N-arylation of amines through Ullmann coupling reactions
This study reports a convenient approach to prepare SiO2/CCPy/Cu(OAc)2 as a novel nanocatalyst, in which melamine-bearing pyridine groups have functionalized SiO2 and can act as a capping agent to stabilize Cu(II) species. The catalyst is characterized through Fourier transform infrared, transmission electron microscopy, field emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET), thermogravimetric analysis, inductivity coupled plasma (ICP), and energy dispersive X-ray (EDX) techniques. Furthermore, its catalytic behavior is evaluated in the N-arylation of indole, imidazole, and aniline during Ull...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Theoretical study of Sn adsorbed on the MgO(100) surface with defects
In this study, the adsorption of Sn atom at various sites on the MgO(100) surface was characterized using a theoretical approach based on density functional theory calculations. Both regular adsorption centers (O2− and Mg2+) and defects (such as neutral and charged O and Mg vacancies) were considered. Several key parameters for these sites with the adsorbed Sn atom were determined to provide its geometric, energetic, and electronic characterization. The interaction between Sn and the Mg vacancy sites is very strong and is associated with a relatively small distance of the adsorbed Sn atom from the surface and with a larg...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Comparative assessment of the ability of a microwave absorber nanocatalyst in the microwave-assisted biodiesel production process
In this study, a carbon-supported KOH/Ca12Al14O33 nanocomposite was fabricated via the microwave combustion method, in which dextrose was used as a carbon source, and its activity in the microwave-assisted transesterification reaction as a microwave absorption material was assessed. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry, Brunauer–Emmett–Teller (BET), field-emission scanning electron microscopy, and energy dispersive X-ray analyses. The results showed that the carbonate and noncarbonate samples had a calcium aluminate (Ca12Al14O33) structure as a s...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Magnetic recyclable eggshell-based mesoporous catalyst for biodiesel production from crude neem oil: Process optimization by central composite design and artificial neural network
Publication date: July 2018Source: Comptes Rendus Chimie, Volume 21, Issue 7Author(s): Adewale S. Oladipo, Olusegun A. Ajayi, Akeem A. Oladipo, Solmaz L. Azarmi, Yusuf Nurudeen, Abdulazeez Y. Atta, Shola S. OgunyemiAbstractA magnetically recyclable eggshell-based catalyst (MKEC) was synthesized to circumvent saponification during the conversion of neem, Jatropha, and waste cooking oils (free fatty acid, 2.3–6.6%) to biodiesel. The characterization results indicated that MKEC had a mesoporous structure with the pore width of 3.24 nm, a specific surface area of 128 m2/g, and a pore volume of 0.045 cm3/g. The results con...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Mn(III)-porphyrin/graphene oxide nanocomposite as an efficient catalyst for the aerobic oxidation of hydrocarbons
In this study, manganese porphyrin was grafted on the surface of graphene oxide nanosheets via covalent bonding to produce a heterogeneous catalyst. The prepared nanocomposite was characterized using X-ray diffraction, UV–vis spectroscopy, scanning electron microscopy, Fourier transform infrared, and thermogravimetric analysis. Atomic absorption spectroscopy was also used to determine the amount of the loaded catalyst. The catalytic efficiency of the immobilized Mn-porphyrin was investigated for the aerobic oxidation of alkenes and saturated alkanes in acetone under mild reaction conditions. The prepared heterogenized ca...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Reprogramming the chemical reactivity of iron in cancer stem cells
Publication date: July 2018Source: Comptes Rendus Chimie, Volume 21, Issue 7Author(s): Tatiana Cañeque, Sebastian Müller, Anne Lafon, Fabien Sindikubwabo, Antoine Versini, Lou Saier, Manon Barutaut, Christine Gaillet, Raphaël RodriguezAbstractCancer stem cells (CSCs) have been shown to be refractory to conventional therapeutic agents, can promote metastasis, and have been linked to cancer relapse. Salinomycin can selectively kill CSCs. We have shown that salinomycin derivatives accumulate in lysosomes and sequester iron in this organelle. As a result, accumulation of iron leads to the production of reactive oxygen speci...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Synthesis and optical and electrochemical properties of polycyclic aromatic compounds based on bis(benzothiophene)-fused fluorene
Publication date: Available online 4 July 2018Source: Comptes Rendus ChimieAuthor(s): Guiting Chen, Xin Li, Ziyun Chen, Chunbao Tang, Wei Yang, Yong CaoAbstractNovel polycyclic aromatic compounds (FBTPhO3 and FBTPhO4), which are based on bis(benzothiophene)-fused fluorene functionalized with oligo(ethylene glycol)-substituted phenyl, were synthesized through an intramolecular electrophilic cyclizing reaction. Thermal measurements revealed their excellent thermal stability and amorphous state. Photoluminescence spectra suggested that they both show deep blue light emission. Cyclic voltammetry tests exhibited that the ioniza...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
From hydrophilic to hydrophobic wood using direct fluorination: A localized treatment
Publication date: August 2018Source: Comptes Rendus Chimie, Volume 21, Issue 8Author(s): Martial Pouzet, Marc Dubois, Karine Charlet, Alexis BéakouAbstractWhen controlled by the treatment duration or the quantity of reactive molecules, direct fluorination using F2 gas is efficient to decrease the hydrophilicity of wood both in the form of massive piece and powder. To prove that silver fir pieces and wood flour (mix of spruce and silver fir species) were investigated as representative examples. In both the cases, hydroxyl groups are converted into CF bonds resulting in the decrease in affinity for water. Fluorination is ma...
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Editorial Board - French
Publication date: August 2018Source: Comptes Rendus Chimie, Volume 21, Issue 8Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Sommaire / Contents
Publication date: August 2018Source: Comptes Rendus Chimie, Volume 21, Issue 8Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
Second “Colloque français de chimie du fluor”: An overview of fluorine chemistry
Publication date: August 2018Source: Comptes Rendus Chimie, Volume 21, Issue 8Author(s): Katia Araujo da Silva, Marc Dubois, Pierre Bonnet (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - July 11, 2018 Category: Chemistry Source Type: research
