Zur Kenntnis der <i>o</i>‐Chinone IX: Darstellung und Eigenschaften einiger Amino‐<i>o</i>‐chinone

Horner, L.; Lang, Hermann

doi:10.1002/cber.19560891217

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…On the other hand, the coordination chemistry of the ortho regio‐isomers is almost unknown. Some fundamental work on 4,5‐bisamino‐substituted ortho ‐quinones was reported by Horner et al., some compounds were tested as antitumor reagents and others patented by Wella as hair dyes . However, the inherent lability of these compounds to polymerization and degradation hampered more research in this area .…”

Section: Introductionmentioning

confidence: 99%

Homo‐ and Heterobinuclear Cu and Pd Complexes with a Bridging Redox‐Active Bisguanidino‐Substituted Dioxolene Ligand: Electronic Structure and Metal–Ligand Electron‐Transfer

Schrempp

Schneider

Kaifer

et al. 2017

Chemistry A European J

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A new redox-active 4,5-bisguanidino-substituted o-benzoquinone ligand L is synthesized, which allows rational access to heterobinuclear complexes through the sequential coordination of two metals. In the examples discussed in this work, mononuclear Cu and Pd complexes are prepared in a first coordination step, and these complexes are then used as precursors to homobinuclear [Cu -L -Cu ] and heterobinuclear [Pd -L -Cu ] complexes. In the heterobinuclear complex, the Pd is coordinated by the softer bisguanidine side of L and the Cu by the harder dioxolene side (in line with the HSAB concept). The heterobinuclear complex is in a temperature-dependent equilibrium with its dimer, with two unsymmetrical Cu-Cl-Cu bridges. The redox-chemistry of the [Cu -L-Cu ] and [Pd -L-Cu ] complexes is studied. One-electron oxidation of both complexes was found to be quasi-reversible in CV experiments, and chemical one-electron oxidation was achieved with NO (SbF ). In the case of the homobinuclear complex [L(CuCl ) ] , intramolecular ligand-metal electron-transfer, triggered by coordination of a CH CN solvent molecule, leads to a temperature-dependent equilibrium between the form [Cu -L -Cu ] at low temperatures (with CH CN coordinated to the Cu atom) and [Cu -L -Cu ] at higher temperatures (without CH CN).

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Section: Introductionmentioning

confidence: 99%

Homo‐ and Heterobinuclear Cu and Pd Complexes with a Bridging Redox‐Active Bisguanidino‐Substituted Dioxolene Ligand: Electronic Structure and Metal–Ligand Electron‐Transfer

Schrempp

Schneider

Kaifer

et al. 2017

Chemistry A European J

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“…Sie zeigen oft bemerkenswerte antibiotische, cytotoxische oder allergene Wirkungen, so daß sie vielen Pflanzen 12 ' 31 , marinen Organismen 141 Versuche zur direkten Aufklärung der Mechanismen von Reaktionen chinoider Verbindungen in biologischen Systemen führten nur selten zur eindeutigen Identifizierung der Reaktionsprodukte. Der Grund liegt offensichtlich in der Instabilität der sich primär bildenden Zwischenstufen und der Komplexität der in Folgereaktionen daraus entstehenden Produktgemische.…”

Section: Introductionunclassified

Chemische Modifikation von Biopolymeren durch Chinone und Chinonmethide

Peter¹

1989

Angewandte Chemie

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“…Spectra of principal components three and four (the products) were compared to the o ‐quinone, p ‐quinone, and 4,4′‐diphenoquinone, the presumably main products of the reaction. No match was found with p ‐quinone, but with o ‐quinone and 4,4′‐diphenoquinone the coincidences are satisfactory , as it is observed in Table . Specifically, the maximum wavelength suggests that the third and fourth components are the o ‐quinone and 4,4′‐diphenoquinone respectively.…”

Section: Resultsmentioning

confidence: 74%

Ultraviolet-Visible Kinetic Study of the Uncatalyzed Bromate Oscillator with Phenol by Multivariate Curve Resolution

Robayo-Molina

Ágreda

2017

Int. J. Chem. Kinet.

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A kinetic study of the uncatalyzed bromate oscillator (UBO) using phenol was carried out by chemometric analysis of the UV/Vis data. The reaction was studied with different starting concentrations of the reagents (sulfuric acid and potassium bromate) and by changing phenol for 2-bromophenol and 4-bromophenol. The number of chemical absorbing species involved in the UV/Vis data was established by singular value decomposition and by the residual fit parameter. Multivariate curve resolution with alternating least squares generated valuable information about the different chemical species along the process (spectral and concentration profiles). These results show the presence of four principal components: two intermediates and two products. The products can be assigned as o-quinone and 4,4 -diphenoquinone, and the principal components associated with the intermediates represent the linear combination of all the intermediates in the reaction mixture. These data were used to generate a model of the UBO-phenol oscillator that reproduces qualitatively the experimental results. C

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Zur Kenntnis der o‐Chinone IX: Darstellung und Eigenschaften einiger Amino‐o‐chinone

Cited by 15 publications

References 9 publications

Homo‐ and Heterobinuclear Cu and Pd Complexes with a Bridging Redox‐Active Bisguanidino‐Substituted Dioxolene Ligand: Electronic Structure and Metal–Ligand Electron‐Transfer

Homo‐ and Heterobinuclear Cu and Pd Complexes with a Bridging Redox‐Active Bisguanidino‐Substituted Dioxolene Ligand: Electronic Structure and Metal–Ligand Electron‐Transfer

Chemische Modifikation von Biopolymeren durch Chinone und Chinonmethide

Ultraviolet-Visible Kinetic Study of the Uncatalyzed Bromate Oscillator with Phenol by Multivariate Curve Resolution

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