Oxo-vanadium (IV) phthalocyanine implanted onto the modified SBA-15 as a catalyst for direct hydroxylation of benzene to phenol in acetonitrile-water medium: A kinetic study

2021 ◽  
Vol 232 ◽  
pp. 116331
Author(s):  
Shohreh Farahmand ◽  
Mehran Ghiaci ◽  
Saeid Asghari
Keyword(s):  
Kinetic Study ◽  
Water Medium ◽  
Hydroxylation Of Benzene ◽  
Direct Hydroxylation

Synthesis of Spherical Mesoporous Co-MCM-41

2009 ◽  
Vol 79-82 ◽  
pp. 131-134
Author(s):  
Peng Sun ◽  
Yan Kong ◽  
Jun Du ◽  
Xin Jie Xu ◽  
Jun Wang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Catalytic Activity ◽  
Significant Influence ◽  
Cobalt Content ◽  
Synthesis Conditions ◽  
Hydroxylation Of Benzene ◽  
Direct Hydroxylation ◽  
Mcm 41

A serious of spherical Co-MCM-41s with different cobalt content was synthesized and characterized by XRD, SEM, N2 isotherms and ICP techniques. The influences of synthesis conditions on the structure were also studied. The use of ascorbic acid as reductant had significant influence on the morphology and the catalytic activity of Co-MCM-41. The prepared samples exhibited higher catalytic activity in the direct hydroxylation of benzene by H2O2 than those with common morphology.

Vanadium Oxyacetylacetonate Grated on Metal Organic Framework as Catalyst for the Direct Hydroxylation of Benzene to Phenol

2020 ◽  
Vol 5 (22) ◽  
pp. 6818-6822
Author(s):  
Qianqian Zhao ◽  
Liuxue Zhang ◽  
Meiyan Zhao ◽  
Panpan Xu ◽  
Xiulian Wang ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Hydroxylation Of Benzene ◽  
Metal Organic ◽  
Direct Hydroxylation ◽  
Organic Framework

scholarly journals A kinetic study and mechanisms of reduction of N, N′-phenylenebis(salicyalideneiminato)cobalt(III) by L-ascorbic acid in DMSO-water medium

Heliyon ◽  
2020 ◽  
Vol 6 (9) ◽  
pp. e04621
Author(s):  
S. Abdulsalam ◽  
S.O. Idris ◽  
G.A. Shallangwa ◽  
A.D. Onu
Keyword(s):  
Ascorbic Acid ◽  
Kinetic Study ◽  
Water Medium

scholarly journals On the Ability of Nickel Complexes Derived from Tripodal Aminopyridine Ligands to Catalyze Arene Hydroxylations

2020 ◽  
Vol 74 (6) ◽  
pp. 489-494
Author(s):  
Eduard Masferrer-Rius ◽  
Raoul M. Hopman ◽  
Jishai van der Kleij ◽  
Martin Lutz ◽  
Robertus J. M. Klein Gebbink
Keyword(s):  
Nickel Complex ◽  
Nickel Complexes ◽  
Chemical Research ◽  
Ligand Structure ◽  
Hydroxylation Of Benzene ◽  
Fluorinated Alcohols ◽  
Hydroxylation Reaction ◽  
Selective Hydroxylation ◽  
Direct Hydroxylation

The development of catalysts for the selective hydroxylation of aromatic C–H bonds is an essential challenge in current chemical research. The accomplishment of this goal requires the discovery of powerful metal-based oxidizing species capable of hydroxylating inert aromatic bonds in a selective manner, avoiding the generation of non-selective oxygen-centered radicals. Herein we show an investigation on the ability of nickel(ii) complexes supported by tripodal tetradentate aminopyridine ligands to catalyze the direct hydroxylation of benzene to phenol with H2O2 as oxidant. We have found that modifications on the ligand structure of the nickel complex do not translate into different reactivity, which differs from previous findings for nickel-based arene hydroxylations. Besides, several nickel(ii) salts have been found to be effective in the oxidation of aromatic C–H bonds. The use of fluorinated alcohols as solvent has been found to result in an increase in phenol yield; however, showing no more than two turn-overs per nickel. These findings raise questions on the nature of the oxidizing species responsible for the arene hydroxylation reaction.

Cu(i) complexes obtained via spontaneous reduction of Cu(ii) complexes supported by designed bidentate ligands: bioinspired Cu(i) based catalysts for aromatic hydroxylation

2020 ◽  
Vol 49 (39) ◽  
pp. 13829-13839
Author(s):  
Sheela Kumari ◽  
Sethuraman Muthuramalingam ◽  
Ashish Kumar Dhara ◽  
U. P. Singh ◽  
Ramasamy Mayilmurugan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Bidentate Ligands ◽  
X Ray ◽  
Spontaneous Reduction ◽  
Hydroxylation Of Benzene ◽  
Aromatic Hydroxylation ◽  
Direct Hydroxylation

Cu(i) complexes were synthesized via spontaneous reduction and X-ray crystal structure of complex 1 was determined. Direct hydroxylation of benzene to phenol afforded selectivity up to 98%. KIE values of 1.69–1.71 supported radical based mechanism.

Sign in / Sign up

Export Citation Format

Share Document