Oxalic Acid

Fluorine-Induced Chiral Coordination Arrays Containing Helical Hydrogen-Bonding Chains of Water or Fluorinated Ligand

“…Unfortunately, several efforts to prepare the Cd II complex of L 2 failed. Notably, oxalamide was converted to oxalate by enduring an in situ reaction in the preparation of the helical or zigzag architectures. All of the samples are insoluble in water and common organic solvents.…”

Fluorine-Induced Chiral Coordination Arrays Containing Helical Hydrogen-Bonding Chains of Water or Fluorinated Ligand

“…Unfortunately, several efforts to prepare the Cd II complex of L 2 failed. Notably, oxalamide was converted to oxalate by enduring an in situ reaction in the preparation of the helical or zigzag architectures. All of the samples are insoluble in water and common organic solvents.…”

Technetium Hydrides Revisited: Syntheses, Structures, and Reactions of [TcH3(PPh3)4] and [TcH(CO)3(PPh3)2]

“…The formation of an oxalato ligand as a result of a reaction between the Tc hydride 5 and phenyl seleninic acid is surprising. Nevertheless, several mechanisms for the formation of oxalic acid or oxalate from simple starting materials such as CO, methanol, or formic acid have been discussed before. − In the present case, two of these mechanisms seem to be reasonable. One is a methanol mediated CO/CO-coupling type reaction, while the second mechanism involves the oxidation of methanol to formic acid or formate followed by the subsequent dehydro-dimerization to give oxalic acid or oxalate.…”

Insights into the carboxyltransferase reaction of pyruvate carboxylase from the structures of bound product and intermediate analogs

“…Oxalate is competitive with respect to oxaloacetate and has a dissociation constant of 8.9 μM for the metal center of chicken liver PC [18]. At neutrality, the two carboxylates of oxalate are deprotonated (pK a1 = 1.19; pK a2 =4.22) [19]. In this ionization state, oxalate is a strong chelator of metal ions and shares structural and chemical properties with the enolpyruvate intermediate.…”

Fluorine-Induced Chiral Coordination Arrays Containing Helical Hydrogen-Bonding Chains of Water or Fluorinated Ligand

“…Unfortunately, several efforts to prepare the Cd II complex of L 2 failed. Notably, oxalamide was converted to oxalate by enduring an in situ reaction in the preparation of the helical or zigzag architectures. All of the samples are insoluble in water and common organic solvents.…”

Technetium Hydrides Revisited: Syntheses, Structures, and Reactions of [TcH3(PPh3)4] and [TcH(CO)3(PPh3)2]

“…The formation of an oxalato ligand as a result of a reaction between the Tc hydride 5 and phenyl seleninic acid is surprising. Nevertheless, several mechanisms for the formation of oxalic acid or oxalate from simple starting materials such as CO, methanol, or formic acid have been discussed before. − In the present case, two of these mechanisms seem to be reasonable. One is a methanol mediated CO/CO-coupling type reaction, while the second mechanism involves the oxidation of methanol to formic acid or formate followed by the subsequent dehydro-dimerization to give oxalic acid or oxalate.…”

Insights into the carboxyltransferase reaction of pyruvate carboxylase from the structures of bound product and intermediate analogs

“…Oxalate is competitive with respect to oxaloacetate and has a dissociation constant of 8.9 μM for the metal center of chicken liver PC [18]. At neutrality, the two carboxylates of oxalate are deprotonated (pK a1 = 1.19; pK a2 =4.22) [19]. In this ionization state, oxalate is a strong chelator of metal ions and shares structural and chemical properties with the enolpyruvate intermediate.…”

Fluorine-Induced Chiral Coordination Arrays Containing Helical Hydrogen-Bonding Chains of Water or Fluorinated Ligand

“…Unfortunately, several efforts to prepare the Cd II complex of L 2 failed. Notably, oxalamide was converted to oxalate by enduring an in situ reaction in the preparation of the helical or zigzag architectures. All of the samples are insoluble in water and common organic solvents.…”

Technetium Hydrides Revisited: Syntheses, Structures, and Reactions of [TcH3(PPh3)4] and [TcH(CO)3(PPh3)2]

“…The formation of an oxalato ligand as a result of a reaction between the Tc hydride 5 and phenyl seleninic acid is surprising. Nevertheless, several mechanisms for the formation of oxalic acid or oxalate from simple starting materials such as CO, methanol, or formic acid have been discussed before. − In the present case, two of these mechanisms seem to be reasonable. One is a methanol mediated CO/CO-coupling type reaction, while the second mechanism involves the oxidation of methanol to formic acid or formate followed by the subsequent dehydro-dimerization to give oxalic acid or oxalate.…”

Insights into the carboxyltransferase reaction of pyruvate carboxylase from the structures of bound product and intermediate analogs

“…Oxalate is competitive with respect to oxaloacetate and has a dissociation constant of 8.9 μM for the metal center of chicken liver PC [18]. At neutrality, the two carboxylates of oxalate are deprotonated (pK a1 = 1.19; pK a2 =4.22) [19]. In this ionization state, oxalate is a strong chelator of metal ions and shares structural and chemical properties with the enolpyruvate intermediate.…”