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  • 1
    Electronic Resource
    Electronic Resource
    One-Step Synthesis of Functionalized Triptycene-quinones as Acceptors for Electron-Transfer Compounds (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 1951-1963 
    Details
    ISSN: 0947-3440
    Keywords: Triptycenes ; Quinones ; Electron-transfer ; Porphyrin quinones ; Diels-Alder reaction ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of appropriate porphyrin-quinone electron-transfer complexes as model compounds for photosynthesis requires access to functionalized triptycene quinone aldehydes with different redox potentials. A synthetic strategy involving a classical Diels-Alder reaction, tautomerization and oxidation was only of limited utility for preparing the desired compounds. Thus, an alternative approach was required and for this purpose a strategy involving the reaction of excess quinone with appropriate anthracene derivatives in acetic acid has been developed. This method affords the target compounds in a single synthetic step in good yields and with high purity. The aldehyde functionality required for the subsequent porphyrin synthesis can be incorporated into either the anthracene or the quinone starting component. Fifteen different triptycene quinones have been synthesized, eight of which have been studied in detail by single crystal X-ray crystallography to provide insight into their structural chemistry and solid-state aggregation properties. Additionally, the synthesis of two porphyrin-quinone target compounds is described.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970922
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  • 2
    Electronic Resource
    Electronic Resource
    Modellreaktionen für die Photosynthese - photoinduzierter Ladungs- und Energietransfer zwischen verknüpften Porphyrin- und Chinon-EinheitenProfessor Fabian Gerson gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 107 (1995), S. 929-947 
    Details
    ISSN: 0044-8249
    Keywords: Chinone ; Elektronentransfer ; Energietransfer ; Photosynthese ; Porphyrinoide ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Photosynthese gehört zu den faszinierenden Feldern aktueller interdisziplinärer Forschung. Es ist wohl ein Wunder, wie die Natur es im Verlauf der Evolution vollbringen konnte, die im Primärschritt der Photosynthese in den Reaktionszentren aus dem photoangeregten Singulettzustand des (Bakterio)Chlorophylldonors heraus erfolgende Ladungstrennung mit einer Quantenausbeute von 100% zu bewerkstelligen, obwohl der einfache Rücktransfer des angeregten Elektrons in den Grundzustand so favorisiert wäre. An biomimetischen, d.h. der Natur nachempfundenen, aus Porphyrinen und Chinonen aufgebauten Modellverbindungen können die Faktoren studiert werden, die die hohe Effizienz der Ladungstrennung bewirken. In diesem Bericht sollen jüngste Untersuchungen an Porphyrinchinonen zum Elektronentransfer im Vordergrund stehen, wobei die Interpretationen der Ergebnisse durchaus nicht in allen Fällen abgeschlossen und häufig sogar noch Gegenstand kontroverser Diskussion sind.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19951070804
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  • 3
    Electronic Resource
    Electronic Resource
    Structural effects on ESR hyperfine coupling constants of some dithiazolidinyl free radicals (1989)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 288-294 
    Details
    ISSN: 0749-1581
    Keywords: ESR ; ENDOR/TRIPLE ; Dithiazolidinyl free radicals ; Sulphur-nitrogen heterocycles ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of related dithiazolidin-2-yl free radicals prepared from cyclic strained alkenes and tetrasulphur dinitride, and an attempt was made to relate the nitrogen and proton hyperfine coupling constants to the radical structures. The radical made from dimethoxybenzonorbornadiene was studied by ENDOR and it was found that isotopic substitution with 15N gives well resolved ENDOR spectra; the TRIPLE measurements showed that the 14N coupling constants are positive whereas all the resolved proton coupling constants are negative.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260270318
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