Convenient Semihydrogenation of Azoarenes to Hydrazoarenes Using H2

2021 ◽  
Author(s):  
Manoj Kumar Sahoo ◽  
Ganesan Sivakumar ◽  
Sanjay Jadhav ◽  
Samrin Shaikh ◽  
Balaraman Ekambaram
Keyword(s):  
Selective Hydrogenation ◽  
Molecular Hydrogen ◽  
Catalytic Method ◽  
Mild Conditions

Convenient and highly selective hydrogenation of azoarenes using molecular hydrogen to access diverse hydrazoarenes is reported. The present catalytic method is general, operationally simple, and operates under exceedingly mild conditions...

scholarly journals High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Nicolás Carrara ◽  
Carolina Betti ◽  
Fernando Coloma-Pascual ◽  
María Cristina Almansa ◽  
Laura Gutierrez ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Selective Hydrogenation ◽  
Nickel Catalysts ◽  
Metallic Phase ◽  
Hydrogen Chemisorption ◽  
Electronic Effects ◽  
X Ray ◽  
Mild Conditions ◽  
Temperature Programmed ◽  
Carbon Catalysts

A series of low-loaded metallic-activated carbon catalysts were evaluated during the selective hydrogenation of a medium-chain alkyne under mild conditions. The catalysts and support were characterized by ICP, hydrogen chemisorption, Raman spectroscopy, temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR micro-ATR), transmission electronic microscopy (TEM), and X-ray photoelectronic spectroscopy (XPS). When studying the effect of the metallic phase, the catalysts were active and selective to the alkene synthesis. NiCl/C was the most active and selective catalytic system. Besides, when the precursor salt was evaluated, PdN/C was more active and selective than PdCl/C. Meanwhile, alkyne is present in the reaction media, and geometrical and electronic effects favor alkene desorption and so avoid their overhydrogenation to the alkane. Under mild conditions, nickel catalysts are considerably more active and selective than the Lindlar catalyst.

scholarly journals The selective hydrogenation of furfural over supported palladium nanoparticle catalysts prepared by sol-immobilisation: effect of catalyst support and reaction conditions

2018 ◽  
Vol 8 (1) ◽  
pp. 252-267 ◽  
Author(s):  
Reem Albilali ◽  
Mark Douthwaite ◽  
Qian He ◽  
Stuart H. Taylor
Keyword(s):  
Selective Hydrogenation ◽  
Catalyst Support ◽  
Palladium Nanoparticle ◽  
Reaction Conditions ◽  
Nanoparticle Catalysts ◽  
Mild Conditions ◽  
Supported Palladium

Pd-TiO2 nanoparticles prepared by sol-immobilisation are very active for selective hydrogenation of furfural under mild conditions, and addition of Pt enhances performance to achieve a 95% yield of tetrahydrofurfuryl alcohol.

scholarly journals Enantioenriched Quaternary α-Pentafluoroethyl Derivatives of Alkyl 1-Indanone-2-Carboxylates

2020 ◽  
Author(s):  
Albert Granados ◽  
Anna Balleteros ◽  
Adelina Vallribera
Keyword(s):  
Hypervalent Iodine ◽  
Catalytic Method ◽  
Quaternary Centers ◽  
Mild Conditions ◽  
Reaction Proceeds ◽  
Mechanistic Investigations ◽  
Derivatives Of

An electrophilic enantioselective catalytic method for the a-pentafluoroethylation of alkyl 1-indanone-2-carboxylates is described. Under the use of La(OTf)<sub>3</sub> in combination with (<i>S,R</i>)-indanyl-<i>pybox</i> ligand good results in terms of yield and enantioselectivities were achieved (up to 89% <i>ee</i>). The reaction proceeds under mild conditions leading to the formation of enantioenriched quaternary centers. This methodology uses an hypervalent iodine(III)-CF<sub>2</sub>CF<sub>3</sub> reagent and mechanistic investigations are consistent with the involvement of a radical pathway.

Selective hydrogenation of nitroarenes under mild conditions by the optimization of active sites in a well defined Co@NC catalyst

2020 ◽  
Vol 22 (17) ◽  
pp. 5730-5741
Author(s):  
Shuo Chen ◽  
Li-Li Ling ◽  
Shun-Feng Jiang ◽  
Hong Jiang
Keyword(s):  
Particle Size ◽  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Nitro Compounds ◽  
Active Species ◽  
Mild Conditions ◽  
Metal Organic ◽  
Aromatic Nitro

The defined catalyst (Co@NC) is prepared through the pyrolysis of the Co-centered metal–organic framework (MOF), in which Co active species (Co–Nx, surface Co NPs) and particle size play important roles in the catalytic hydrogenation of aromatic nitro compounds.

Highly efficient one-pot multi-directional selective hydrogenation and N-alkylation catalyzed by Ru/LDH under mild conditions

2020 ◽  
Vol 596 ◽  
pp. 117536 ◽  
Author(s):  
Sishi Zhang ◽  
Jie Xu ◽  
Hongmei Cheng ◽  
Cuicui Zang ◽  
Bin Sun ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
One Pot ◽  
Mild Conditions ◽  
Highly Efficient

scholarly journals Highly selective hydrogenation of furfural over supported Pt nanoparticles under mild conditions

2016 ◽  
Vol 180 ◽  
pp. 580-585 ◽  
Author(s):  
Martin J. Taylor ◽  
Lee J. Durndell ◽  
Mark A. Isaacs ◽  
Christopher M.A. Parlett ◽  
Karen Wilson ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Pt Nanoparticles ◽  
Mild Conditions

A New Supported Rhodium Catalyst for Selective Hydrogenation of Nitriles to Primary Amines

2007 ◽  
Vol 72 (4) ◽  
pp. 468-474 ◽  
Author(s):  
Peter T. Witte
Keyword(s):  
Selective Hydrogenation ◽  
High Selectivity ◽  
Rhodium Catalyst ◽  
Primary Amines ◽  
Mild Conditions ◽  
Pharmaceutical Applications ◽  
Strong Acids ◽  
Hydrogenation Of Nitriles ◽  
Supported Rhodium Catalyst

Nitriles are converted to primary amines with high selectivity using a newly developed alumina-supported rhodium catalyst. The high selectivity is obtained without any additives, which are often used to prevent the formation of higher amines. The catalyst is active under mild conditions in various solvents, which makes it specifically suitable for use in pharmaceutical applications or for other substrates that can react with additives like strong acids or bases.

Experimental and mathematical optimization of the peroxide delignification of larch in the presence of MnSO4 catalyst

2020 ◽  
Vol 20 (1) ◽  
pp. 67-75
Author(s):  
I. G. Sudakova ◽  
N. V. Garyntseva ◽  
A. I. Chudina ◽  
B. N. Kuznetsov
Keyword(s):  
Mathematical Optimization ◽  
Single Step ◽  
High Yield ◽  
Optimal Conditions ◽  
Optimal Parameters ◽  
Mathematical Methods ◽  
Catalytic Method ◽  
Mild Conditions ◽  
Xrd Studies ◽  
Peroxide Delignification

Experimental and mathematical methods were used to obtain the optimal parameters of peroxide delignification of larch in the presence of MnSO4 catalyst, which provide a high yield of cellulose (44.3 wt.%) with a low content of residual lignin: temperature 100 °C, content of H2O2 6 wt.%, CH3COOH 25 wt.%, hydromodulus 15, and duration 3 h. The cellulose produced under optimal conditions had the following chemical composition: cellulose 92.7 wt.%, lignin 0.6 wt.%, and hemicellulose 5.7 wt.%. IR spectroscopy and XRD studies revealed that the structure of cellulose produced from larch is similar to that of industrial microcrystalline cellulose. The proposed catalytic method allows obtaining larch-derived cellulose with a minimum content of lignin under mild conditions in a single step with a high yield, crystallinity 0.8 and crystallite size 3.0 nm.

A new catalytic method for ecofriendly synthesis of bis- and trisindolylmethanes by zirconyldodecylsulfate under mild conditions

2009 ◽  
Vol 46 (3) ◽  
pp. 535-539 ◽  
Author(s):  
Maasoumeh Jafarpour ◽  
Abdolreza Rezaeifard ◽  
Tayebeh Golshani
Keyword(s):  
Catalytic Method ◽  
Mild Conditions
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