The electrochemical synthesis of hydrogen peroxide (H2O2) via a two-electron (2 e−) oxygen reduction reaction (ORR) process provides promising alternative to replace the energy-intensive anthraquinone process. Herein, we develop facile template-protected strategy synthesize highly active quinone-rich porous carbon catalyst for H2O2 production. optimized PCC900 material exhibits remarkable activ...

Lipophilicity is one of the most important parameters determining pharmacodynamic and pharmacokinetic properties, as well toxicity many compounds. The subject research was to determine lipophilicity betulin-1,4-quinone hybrids using thin layer chromatography in reverse phase system computer programs calculate its theoretical models. correlation between experimental values analyzed. Lipinski’s V...

Experiments with crude extracts of Pseudomonas carboxydohydrogena revealed that a quinone is necessary for CO oxidation, and that cytochromes of the a, b, and c types and functional terminal oxidase(s) are found in cells grown on CO as the sole source of carbon and energy. CO dehydrogenase delivers electrons to the electron transport system at the level of quinone, and nicotinamide adenine dinu...

In the title compound, C19H10ClNO4, the dihedral angle between the naphtho-quinone and coumarin rings is 48.99 (6)°. In the crystal, mol-ecules are linked by strong N-H⋯O hydrogen bonds into chains with graph-set motif C(6) along [101]. The packing also features π-π stacking inter-actions between naphtho-quinone and coumarin rings [centroid-to-centroid distances = 3.7679 (12) and 3.6180 (13) Å].

The authors wish to inform readers that there is an error in the chemical structures shown in Figure 4 of this paper [1]. The structure shown in the bottom left corner is an extremely unlikely type of radical. Following the proposed route, it should yield an ortho-quinone (without the unpaired electron) and a pyranosyl sugar free radical. The ortho-quinone should then undergo nucleophilic attac...

The cytochrome bc(1) complex catalyzes electron transfer from ubiquinol to cytochrome c by a protonmotive Q cycle mechanism in which electron transfer is linked to proton translocation across the inner mitochondrial membrane. In the Q cycle mechanism proton translocation is the net result of topographically segregated reduction of quinone and reoxidation of quinol on opposite sides of the membr...

For the three Gram-negative bacteria, Pseudomonas fluorescens, Escherichia coli, and Erwinia amylovora, p-benzoquinone was the principal bactericidal agent formed in vitro during the oxidation of hydroquinone by horseradish peroxidase, whereas no toxicity could be associated with either phenolic or oxygen-free radicals. Even the continuous generation of p-benzosemiquinone during the simultaneou...

Oxidized metabolites of dopamine known as dopamine quinone derivatives are thought to play a pivotal role in the degeneration of nigrostriatal dopaminergic neurons in Parkinson's disease. Although such quinone derivatives are usually produced via the autoxidation of catecholamines, tyrosinase, which is a key enzyme in melanin biosynthesis via the production of DOPA and subsequent molecules, can...