scholarly journals Selective oxidation of uronic acids into aldaric acids over gold catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19502-19507 ◽  
Author(s):  
Sari Rautiainen ◽  
Petra Lehtinen ◽  
Jingjing Chen ◽  
Marko Vehkamäki ◽  
Klaus Niemelä ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Building Block ◽  
Gold Catalyst ◽  
Uronic Acids ◽  
Mild Conditions ◽  
Aldaric Acids

Uronic acids available from hemicelluloses were oxidized into aldaric acids, valuable building block chemicals. Au/Al2O3 oxidized glucuronic and galacturonic acids quantitatively to the corresponding glucaric and galactaric acids at mild conditions.

scholarly journals Gold-catalyzed reaction of oxabicyclic alkenes with electron-deficient terminal alkynes to produce acrylate derivatives

2013 ◽  
Vol 9 ◽  
pp. 1969-1976 ◽  
Author(s):  
Yin-wei Sun ◽  
Qin Xu ◽  
Min Shi
Keyword(s):  
Gold Catalyst ◽  
Addition Product ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
Ethynyl Ketone ◽  
Oxabicyclic Alkenes

Oxabicyclic alkenes can react with electron-deficient terminal alkynes in the presence of a gold catalyst under mild conditions, affording the corresponding addition products in moderate yields. When using alkynyl esters as substrates, the (Z)-acrylate derivatives are obtained. Using but-3-yn-2-one (ethynyl ketone) as a substrate, the corresponding addition product is obtained with (E)-configuration. The proposed mechanism of these reactions is also discussed.

Highly Selective Oxidation of Cinnamaldehyde to Benzaldehyde by Hydrogen Peroxide in Mild Conditions

2014 ◽  
Vol 522-524 ◽  
pp. 458-464
Author(s):  
Yuan Mei Nie ◽  
Yong Peng An ◽  
Cai Hua Peng ◽  
Xing Dong Yao
Keyword(s):  
Hydrogen Peroxide ◽  
Hydrogen Bond ◽  
Sodium Bicarbonate ◽  
Propylene Glycol ◽  
Selective Oxidation ◽  
High Selectivity ◽  
Protic Solvent ◽  
Hydrogen Bond Interaction ◽  
Mild Conditions ◽  
Effect Of Solvent

Benzaldehyde was produced from oxidation of cinnamaldehyde by hydrogen peroxide in propylene glycol in the presence of sodium bicarbonate. Protic solvent demonstrated high selectivity and the yield of benzaldehyde could reach up to 82% in propylene glycol. The effect of solvent on the selectivity was attributed to hydrogen bond interaction between the oxidation intermediate epoxide and the solvent.

scholarly journals Generation of Bis(ferrocenyl)silylenes from Siliranes

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5917
Author(s):  
Yang Pan ◽  
Shogo Morisako ◽  
Shinobu Aoyagi ◽  
Takahiro Sasamori
Keyword(s):  
Transition Metal ◽  
Building Block ◽  
Building Blocks ◽  
Redox Behavior ◽  
Organosilicon Compounds ◽  
Design And Synthesis ◽  
Mild Conditions ◽  
Redox Active ◽  
Electronic Perturbation ◽  
Active Transition

Divalent silicon species, the so-called silylenes, represent attractive organosilicon building blocks. Isolable stable silylenes remain scarce, and in most hitherto reported examples, the silicon center is stabilized by electron-donating substituents (e.g., heteroatoms such as nitrogen), which results in electronic perturbation. In order to avoid such electronic perturbation, we have been interested in the chemistry of reactive silylenes with carbon-based substituents such as ferrocenyl groups. Due to the presence of a divalent silicon center and the redox-active transition metal iron, ferrocenylsilylenes can be expected to exhibit interesting redox behavior. Herein, we report the design and synthesis of a bis(ferrocenyl)silirane as a precursor for a bis(ferrocenyl)silylene, which could potentially be used as a building block for redox-active organosilicon compounds. It was found that the isolated bis(ferrocenyl)siliranes could be a bottleable precursor for the bis(ferrocenyl)silylene under mild conditions.

Macroporous polystyrene degraded and functionalized chromium MPS-Cr(iii)-alen complex as a sustainable porous catalyst for CO2 fixation under atmospheric pressure and selective oxidation of aromatic alkenes

2020 ◽  
Vol 44 (32) ◽  
pp. 13852-13862
Author(s):  
Priyanka Paul ◽  
Noor Salam ◽  
Aslam Khan ◽  
Debasis Das ◽  
Seikh Mafiz Alam ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Atmospheric Pressure ◽  
Co2 Fixation ◽  
Cyclic Carbonates ◽  
Porous Catalyst ◽  
Mild Conditions ◽  
Benign Synthesis

The benign synthesis of porous polystyrene supported chromium(iii) catalyst has been carried out for the production of cyclic carbonates via CO2 fixation under atm. pressure and for the selective oxidation of aromatic alkenes under mild conditions.

Facile construction of leaf-like WO3 nanoflakes decorated on g-C3N4 towards efficient oxidation of alcohols under mild conditions

2018 ◽  
Vol 42 (20) ◽  
pp. 16523-16532 ◽  
Author(s):  
Cai Xu ◽  
Xiaozhong Wang ◽  
Gang Xu ◽  
Yingqi Chen ◽  
Liyan Dai
Keyword(s):  
Selective Oxidation ◽  
Aqueous Media ◽  
Mild Conditions ◽  
Oxidation Of Alcohols

Selective oxidation of aryl and alkyl alcohols with H2O2 in aqueous media catalyzed by a well-defined WO3/g-C3N4 composite.

Experimental and Theoretical Investigation of the Role of Bismuth in Promoting the Selective Oxidation of Glycerol over Supported Pt–Bi Catalyst under Mild Conditions

ACS Catalysis ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 6071-6083 ◽  
Author(s):  
Shixiang Feng ◽  
Jun Yi ◽  
Hiroki Miura ◽  
Naoki Nakatani ◽  
Masahiko Hada ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Theoretical Investigation ◽  
Mild Conditions
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