ChemInform Abstract: OXALIC ACID DERIVATIVES BY OXIDATIVE COUPLING OF CARBON MONOXIDE WITH NICKEL

1984 ◽  
Vol 15 (3) ◽  
Author(s):  
H. HOBERG ◽  
F. J. FANANAS ◽  
H. J. RIEGEL
Keyword(s):  
Carbon Monoxide ◽  
Oxalic Acid ◽  
Oxidative Coupling

E.S.R. studies of the oxidative coupling of some bisphenols

1975 ◽  
Vol 28 (2) ◽  
pp. 343 ◽  
Author(s):  
SM Colegate ◽  
FR Hewgill ◽  
GB Howie
Keyword(s):  
Carbon Monoxide ◽  
Alkaline Solution ◽  
Unpaired Electron ◽  
Oxidative Coupling ◽  
Radical Anion ◽  
Neutral Solution

E.s.r. spectroscopy and the identification of products show that oxidation of 3,5,3?,5?-tetra-t-butyl-4,4?-dihydroxybenzophenone in neutral solution gives 3,5,3?,5?-tetra-t-butyldipheno-4,4?-quinone. If oxygen is present 2,6-di-t-butyl-p-benzoquinone is also formed. The evolution of carbon monoxide suggests that bis-spirodienones are intermediate in the formation of these products. E.s.r. spectra of radicals produced by oxidation of 3,5,3?,5?-tetra-t-butylbiphenyl-4,4?- dio and 2,6-di-t-butylhydro-quinone have been re-examined. In alkaline solution 3,5,3?,5?-tetra-t-butyl-4,4?-dihydroxybenzo-phenone is oxidized to a radical anion in which the unpaired electron is delocalized over both rings. ��� Attempts to detect unsymmetrical bisaryloxy radicals were unsuccessful, 3?,5?-di-t-butyl-4,4?-dihydroxy-3,5-dimethoxybenzophenone forming only the radical derived from the syringoyl portion, and 2,4?- oxydiphenol ether forming only the 4?-oxy radical. Comparison with the observation of both radicals when a mixture of guaiacol and p- methoxyphenol was oxidized suggests that C-O-C coupling in 2,4?- oxydiphenol proceeds by direct radical pairing.

The oxidation of gaseous glyoxal

1965 ◽  
Vol 288 (1412) ◽  
pp. 1-16 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Peroxide ◽  
Carbon Monoxide ◽  
Oxalic Acid ◽  
The Other ◽  
Product Analysis ◽  
Glyoxalic Acid ◽  
Induced Decomposition ◽  
Two Stages

The oxidation of gaseous glyoxal has been studied at temperatures between 290 and 370 °C both manometrically and by detailed product analysis. The reaction has been shown to occur in two stages; in the first, glyoxal reacts to give mainly carbon monoxide and glyoxalic acid and in the second, glyoxalic acid is subject to further oxidation to oxalic acid, hydrogen peroxide, carbon dioxide and water. Of the two previous investigations of the reaction, that of Steacie, Hatcher & Horwood (1935 a ) has been shown to have been concerned with the first stage and in the other (Newitt, Baxt & Kelkar 1939), carried out at ignition temperatures, the reaction proceeded through both stages. The oxidation is accompanied by an oxygen induced decomposition and a mechanism similar to that proposed by one of us (Axford & Norrish 1948) for the oxidation of formaldehyde, involving OH, CHO and HO 2 radicals has been developed and shown to account satisfactorily for the observed facts.

Oxalic acid as the in situ carbon monoxide generator in palladium-catalyzed hydroxycarbonylation of arylhalides

2017 ◽  
Vol 15 (23) ◽  
pp. 5033-5040 ◽  
Author(s):  
Changdong Shao ◽  
Ailan Lu ◽  
Xiaoling Wang ◽  
Bo Zhou ◽  
Xiaohong Guan ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Oxalic Acid ◽  
Highly Efficient ◽  
Palladium Catalyzed

Oxalic acid as a highly efficient, safe and tractable concentrated carbon monoxide surrogate was successfully introduced into the palladium-catalyzed hydroxycarbonylation of arylhalides.

Oxidative coupling of amines and carbon monoxide catalyzed by palladium complexes. Mono- and double carbonylation reactions promoted by iodine compounds

1990 ◽  
Vol 68 (9) ◽  
pp. 1544-1547 ◽  
Author(s):  
Ilan Pri-Bar ◽  
Howard Alper
Keyword(s):  
Carbon Monoxide ◽  
Oxidative Coupling ◽  
Room Temperature ◽  
Palladium Complexes ◽  
Secondary Amines ◽  
Primary Amines ◽  
Palladium Acetate ◽  
Principal Product ◽  
Iodine Compounds ◽  
Primary And Secondary Amines

Iodine is an effective promoter for the carbonylation of primary and secondary amines to ureas using palladium acetate as the catalyst and a base (e.g. K2CO3) in acetonitrile (3 h at 95 °C and 2.7 atm). Oxamides are formed in excellent yields when secondary amines are carbonylated in the presence of iodide ion and oxygen, while primary amines give ureas as the principal product at 95 °C, and oxamide at room temperature. Keywords: oxamides, ureas, double carbonylation, amines.

scholarly journals A palladium-catalyzed C–H functionalization route to ketones via the oxidative coupling of arenes with carbon monoxide

2020 ◽  
Vol 11 (11) ◽  
pp. 3104-3109
Author(s):  
Taleah M. Levesque ◽  
R. Garrison Kinney ◽  
Bruce A. Arndtsen
Keyword(s):  
Carbon Monoxide ◽  
Oxidative Coupling ◽  
Building Blocks ◽  
Aryl Ketones ◽  
Palladium Catalyzed

A palladium catalyzed route to prepare aryl ketones from their two fundamental building blocks, two arenes and carbon monoxide, is described.

Spectrophotometric determination of urinary oxalate with oxalate oxidase prepared from moss.

1980 ◽  
Vol 26 (7) ◽  
pp. 827-830 ◽  
Author(s):  
M F Laker ◽  
A F Hofmann ◽  
B J Meeuse
Keyword(s):  
Hydrogen Peroxide ◽  
Oxalic Acid ◽  
Oxidative Coupling ◽  
Oxalate Oxidase ◽  
Ion Exchange Resins ◽  
Urinary Oxalate ◽  
Moss Species ◽  
Chemical Technique ◽  
Exchange Resins

Abstract A novel spectrophotometric enzymic procedure for estimating oxalic acid in urine is described. Oxalate oxidase, prepared from moss species, converts oxalic acid to hydrogen peroxide and carbon dioxide. Hydrogen peroxide is determined enzymatically with horseradish peroxidase, by oxidative coupling of 3-methyl-2-benzothiazolinone hydrazone with N,N-dimethylaniline; the resulting indamine due is determined spectrophotometrically at 595 nm. Interfering substances are removed by adsorption to ion-exchange resins and oxidation with charcoal, thus avoiding oxalate recovery problems accompanying oxalate isolation. The procedure is rapid, sensitive, linear, and precise. Results agreed well with those obtained with a widely used chemical technique.

CHEMICAL EFFECTS OF THE C12(γ,n)C11 REACTION IN CARBONATES

1956 ◽  
Vol 34 (3) ◽  
pp. 189-192 ◽  
Author(s):  
W. J. Edwards ◽  
K. J. McCallum
Keyword(s):  
Carbon Monoxide ◽  
Calcium Carbonate ◽  
Oxalic Acid ◽  
Sodium Bicarbonate ◽  
Formic Acid ◽  
Glyoxylic Acid ◽  
Photoneutron Reaction ◽  
Carbonate Carbon ◽  
Chemical Effects ◽  
Glycollic Acid

The chemical effects following the carbon photoneutron reaction in calcium carbonate and sodium bicarbonate have been studied. After solution of the irradiated crystals, C11 was found to be present in the forms of carbonate, carbon monoxide, formic acid, oxalic acid, glyoxylic acid, and glycollic acid. The relative amounts of C11 appearing in each form agreed closely with those found previously for irradiations of solid sodium carbonate.

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