ChemInform Abstract: Raney Co-Al Alloy, an Efficient Catalyst for the Selective Incorporation of Deuterium Atoms at the Benzylic Position of Aromatic Compounds.

ChemInform ◽  
2010 ◽  
Vol 27 (28) ◽  
pp. no-no
Author(s):  
T. TSUKINOKI ◽  
K. ISHIMOTO ◽  
M. MUKUMOTO ◽  
M. SUZUKI ◽  
T. KAWAJI ◽  
...  
Keyword(s):  
Aromatic Compounds ◽  
Al Alloy ◽  
Efficient Catalyst ◽  
Selective Incorporation

Construction of a combined enzyme system of graphene oxide and manganese peroxidase for efficient oxidation of aromatic compounds

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7976-7985
Author(s):  
Shichao Yang ◽  
Jun Yang ◽  
Tao Wang ◽  
Liuqing Li ◽  
Siming Yu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aromatic Compounds ◽  
Manganese Peroxidase ◽  
Enzyme System ◽  
Dye Decolorization ◽  
Irpex Lacteus ◽  
Efficient Catalyst ◽  
Highly Efficient

We report a highly efficient catalyst by a combination of graphene oxide and manganese peroxidase from Irpex lacteus F17 for the oxidation of aromatic substances and dye decolorization.

scholarly journals Friedel-crafts acylation of aromatic compounds using Triflat bismuth

2014 ◽  
Vol 17 (2) ◽  
pp. 10-14
Author(s):  
Phuong Hoang Tran ◽  
Thanh Duy Anh Nguyen ◽  
Thach Ngoc Le
Keyword(s):  
Reaction Time ◽  
Acetic Anhydride ◽  
Lewis Acid ◽  
Aromatic Compounds ◽  
Good Yield ◽  
Efficient Catalyst ◽  
Short Reaction Time ◽  
Mild Conditions ◽  
Bismuth Triflate ◽  
Work Up

Friedel-Crafts acylation of aromatic compounds with acetic anhydride as acylating reagent was investigated in the presence of Lewis acid. Bismuth trifluoromethanesulfonate was found to be efficient catalyst for Friedel-Crafts acetylation under mild conditions. Bismuth triflate is safe-to-handle, simple and clean work-up, good yield and short reaction time

scholarly journals Benzoylation of aryl methyl ether using catalytic system of Gd(OTf)3/MSAA

2015 ◽  
Vol 18 (2) ◽  
pp. 221-227
Author(s):  
Phuong Hoang Tran ◽  
Hai Truong Nguyen ◽  
Thach Ngoc Le
Keyword(s):  
Microwave Irradiation ◽  
Benzoic Acid ◽  
Organic Synthesis ◽  
Catalytic System ◽  
Aromatic Compounds ◽  
Good Yield ◽  
Efficient Catalyst ◽  
Mild Conditions ◽  
Work Up ◽  
Aryl Methyl

The Friedel-Crafts acylation is an important reaction in organic synthesis. Benzoylation of aromatic compounds with benzoic acid as acylating reagent using catalytic system of Gd(OTf)3/MSAA was investigated under microwave irradiation. Catalytic system of Gd(OTf)3/MSAA was found to be an efficient catalyst for FriedelCrafts benzoylation under mild conditions. In addition, Gd(OTf)3/MSAA is safe-to-handle, simple clean work-up and gives good yield.

scholarly journals Cobalt- and rhodium-catalyzed carboxylation using carbon dioxide as the C1 source

2018 ◽  
Vol 14 ◽  
pp. 2435-2460 ◽  
Author(s):  
Tetsuaki Fujihara ◽  
Yasushi Tsuji
Keyword(s):  
Carbon Dioxide ◽  
Aromatic Compounds ◽  
Coupling Reaction ◽  
Cobalt Complexes ◽  
Efficient Catalyst ◽  
Carbon Bond ◽  
Bond Forming ◽  
Carbon Carbon Bond ◽  
Styrene Derivatives ◽  
Reductive Carboxylation

Carbon dioxide (CO2) is one of the most important materials as renewable chemical feedstock. In this review, the Co- and Rh-catalyzed transformation of CO2 via carbon–carbon bond-forming reactions is summarized. Combinations of metals (cobalt or rhodium), substrates, and reducing agents realize efficient carboxylation reactions using CO2. The carboxylation of propargyl acetates and alkenyl triflates using cobalt complexes as well as the cobalt-catalyzed reductive carboxylation of α,β-unsaturated nitriles and carboxyamides in the presence of Et2Zn proceed. A Co complex has been demonstrated to act as an efficient catalyst in the carboxylation of allylic C(sp3)–H bonds. Employing zinc as the reductant, carboxyzincation and the four-component coupling reaction between alkyne, acrylates, CO2, and zinc occur efficiently. Rh complexes also catalyze the carboxylation of arylboronic esters, C(sp2)–H carboxylation of aromatic compounds, and hydrocarboxylation of styrene derivatives. The Rh-catalyzed [2 + 2 + 2] cycloaddition of diynes and CO2 proceeds to afford pyrones.

Synthesis of cetylpyridiniumtribromide (CetPyTB) reagent by noble synthetic route and bromination of organic compounds

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Organic Compounds ◽  
Aromatic Compounds ◽  
Synthetic Route ◽  
Efficient Catalyst

Cetylpyridiniumtribromide (CetPyTB) was prepared by a noble synthetic protocol and reactivity studies was also performed. Result indicates that the reagent shows good capability as a brominating agent for carbon/electron-rich heterocyclic aromatic compounds in addition to an efficient catalyst for acetylation of the alcohols, therefore proving it to be a note-worthy addition to the current organic tribromide reagents.

Silica sulfuric acid as mild and efficient catalyst for the preparation of poly-hydroxyl aromatic compounds under mild and heterogeneous conditions

2011 ◽  
Vol 15 (2) ◽  
pp. 373-381 ◽  
Author(s):  
Ali Khalafi-Nezhad ◽  
Abolfath Parhami ◽  
Rahele Bargebid ◽  
Saghar Molazade ◽  
Abdolkarim Zare ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Aromatic Compounds ◽  
Silica Sulfuric Acid ◽  
Efficient Catalyst

Effets of surfaces on precipitate morphology in irradiated thin foils

1978 ◽  
Vol 36 (1) ◽  
pp. 654-655
Author(s):  
D.I. Potter ◽  
A. Taylor
Keyword(s):  
Ion Irradiation ◽  
Dark Field Image ◽  
Thin Foil ◽  
Dark Field ◽  
Al Alloy ◽  
Bright Field Image ◽  
Dislocation Loops ◽  
Precipitate Morphology ◽  
Thin Foils

Thermal aging of Ni-12.8 at. % A1 and Ni-12.7 at. % Si produces spatially homogeneous dispersions of cuboidal γ'-Ni3Al or Ni3Si precipitate particles arrayed in the Ni solid solution. We have used 3.5-MeV 58Ni+ ion irradiation to examine the effect of irradiation during precipitation on precipitate morphology and distribution. The nearness of free surfaces produced unusual morphologies in foils thinned prior to irradiation. These thin-foil effects will be important during in-situ investigations of precipitation in the HVEM. The thin foil results can be interpreted in terms of observations from bulk irradiations which are described first.Figure 1a is a dark field image of the γ' precipitate 5000 Å beneath the surface(∿1200 Å short of peak damage) of the Ni-Al alloy irradiated in bulk form. The inhomogeneous spatial distribution of γ' results from the presence of voids and dislocation loops which can be seen in the bright field image of the same area, Fig. 1b.

A microscopic marker experiment study on high temperature oxidation of Ni-Al alloy

1986 ◽  
Vol 44 ◽  
pp. 514-515
Author(s):  
Shou-kong Fan
Keyword(s):  
Transport Mechanism ◽  
High Temperature Oxidation ◽  
Transverse Section ◽  
Al Alloy ◽  
Metal Interface ◽  
Electron Microscopic ◽  
Temperature Oxidation ◽  
Analytical Electron ◽  
Microscopic Studies ◽  
First Time

Transmission and analytical electron microscopic studies of scale microstructures and microscopic marker experiments have been carried out in order to determine the transport mechanism in the oxidation of Ni-Al alloy. According to the classical theory, the oxidation of nickel takes place by transport of Ni cations across the scale forming new oxide at the scale/gas interface. Any markers deposited on the Ni surface are expected to remain at the scale/metal interface after oxidation. This investigation using TEM transverse section techniques and deposited microscopic markers shows a different result,which indicates that a considerable amount of oxygen was transported inward. This is the first time that such fine-scale markers have been coupled with high resolution characterization instruments such as TEM/STEM to provide detailed information about evolution of oxide scale microstructure.

Sign in / Sign up

Export Citation Format

Share Document