Decarboxylation Of Oxalic Acid Research Articles

Influence of the structure of the macroheterocyclic ligand on the catalytic properties of metal tetraarenoporphyrazine complexes: III. Oxidative decarboxylation of oxalic acid

The catalytic activity of cobalt complexes of a series of tetraarenoporphyrazines in oxidative decarboxylation of oxalic acid under heterogeneous conditions was studied. The structure of the macroheterocycle exerts a significant effect on the catalytic properties of the metal complexes.

Hydrogen generation using Cu(II)/WO 3 and oxalic acid by visible light

Radiations of wavelength ⩾ 410 nm (∼99% intensity at 436 nm) were found to effect the photo-Kolbe reaction in oxalic acid in the presence of Cu(II) doped WO 3 particles, simultaneously generating CO 2 and H 2. The conduction band electrons of the semiconductors are, possibly, involved in the reduction of H + to H 2 in the presence of Cu(II) as dopant. The diffuse reflection measurements showed that Cu(II) doped WO 3 enhanced the absorption of the semiconductor in the visible region of the solar radiation. The rate of disappearance of oxalic acid followed Langmuir kinetics. Experiments conducted under direct solar radiation also proved that the Cu(II)/WO 3 catalyst is efficient in the decarboxylation of oxalic acid.

Intramolecular 13C kinetic isotope effects in the decarboxylation of oxalic acid in dioxane solution

Intramolecular 13C kinetic isotope effects in the decomposition in dioxane solution of oxalic acid to carbon dioxide and formic acid were determined at several temperatures between 102 and 141°C. The isotope effect is small (approximately 0.5%) and any temperature dependence is masked by the experimental imprecision (which averages about 0.09%). The method of three-element reaction coordinates (with ν1‡=0) was employed to expose possible properties of the transition state. Relatively good definition of transition state properties is obtained with several models. But, when one requires simultaneous fit of the model calculations to the results recorded here and to the intermolecular isotope effects reported earlier (’’double correspondence’’), the parameters are severly confined. The best double correspondence is obtained when: (a) transition state force constants are set to correspond to bond orders (near the C atom which will appear in carbon dioxide product) of C–C near 0.1, of C–O near 1.9, with that of O–H set at 0.5; (b) the relative internal coordinate displacements comprising the reaction coordinate eigenvector are C–C extension, 0.50 to 0.75; C–O contraction, 0.15 to 0.18; and O–H extension, 0.35 to 0.07. Anharmonicity and other small corrections are neglected without substantial effect on the conclusions described.

Intermolecular 13C kinetic isotope effects in the decarboxylation of oxalic acid in dioxane solution

Intermolecular 13C kinetic isotope effects in the decomposition in dioxane solution of oxalic acid to carbon dioxide and formic acid were determined at several temperatures between 80 and 132 °C. The isotope effect is normal in sign (k12C ≳ k13C), and approximately 3% in magnitude; the temperature dependence (small over the range of experimental temperatures) may be complex, if real. The method of three-element reaction coordinates (with ν‡1=0) was employed to expose possible properties of the transition state. The reaction coordinate eigenvectors yielding best correspondence to the experimental data consist of C–C bond extension, C–O bond contraction, and either (a) O–H bond extension or (b) contraction of the angle O–C–C to linearize O–C–O, these displacements being sited about the C atom which will appear in carbon dioxide product. The differences in the same region between reactant and transition state force fields which yield calculated results in best agreement with the experimental measurements are F‡C–C = 0.125 F0C–C, F‡C–H = 0.5 F0O–H, F‡C–O = 0.875 F0C–O, and F‡bend = (C‡/C0)F0bend, where C is the product of the bond orders of the stretching coordinates defining the bond angle.

Decarboxylation of Oxalic Acid during Ripening of Banana Fruit (Musa sapientumL.)

(1972). Decarboxylation of Oxalic Acid during Ripening of Banana Fruit (Musa sapientum L.) Agricultural and Biological Chemistry: Vol. 36, No. 11, pp. 2021-2024.

Decarboxylation of Oxalic Acid during Ripening of Banana Fruit (Musa sapientum L.)

(1972). Decarboxylation of Oxalic Acid during Ripening of Banana Fruit (Musa sapientum L.) Agricultural and Biological Chemistry: Vol. 36, No. 11, pp. 2021-2024.

Further Studies on the Decarboxylation of Oxalic Acid in Polar Solvents

Further Studies on the Decarboxylation of Oxalic Acid in Polar Solvents

The Decarboxylation of Oxalic Acid in 6-Methylquinoline and in 8-Methylquinoline

The Decarboxylation of Oxalic Acid in 6-Methylquinoline and in 8-Methylquinoline

The Effect of Water and of Glycerol on the Decarboxylation of Oxalic Acid

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effect of Water and of Glycerol on the Decarboxylation of Oxalic AcidLouis Watts ClarkCite this: J. Am. Chem. Soc. 1955, 77, 23, 6191–6192Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 December 1955https://doi.org/10.1021/ja01628a028RIGHTS & PERMISSIONSArticle Views183Altmetric-Citations19LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (236 KB) Get e-Alerts Get e-Alerts