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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Wasserstoffentwicklung aus Viologen-Radikalen und aus photochemisch reduzierten Zinn(IV) Porphyrinen in Gegenwart von Kolloidalem PlatinDie Stöchiometrie der platinkatalysierten Reaktion von zwei Methylviologen-Radikalkationen mit zwei Protonen zu zwei Methylviologen-Dikationen und einem Molekül Wasserstoff wird belegt. - Wasserlösliche Zinn(IV)-Porphyrine werden mittels EDTA und sichtbarem Licht über Chlorine zu Isobakteriochlorinen reduziert. In Gegenwart von kolloidalem Platin bleibt die Isobakteriochlorin-Bildung aus, und molekularer Wasserstoff wird gebildet. Der Umsatz beträgt etwa 25 Mol Wasserstoff pro Mol Porphyrin und Stunde. Isobakteriochlorine werden in Gegenwart von Platin unter Luft oder Argon zu Chlorinen dehydriert
    Notes: The stoichiometry of the platinum-catalyzed reaction of two methylviologen radical cations and two protons yielding two methylviologen dications and one molecule of hydrogen is demonstrated. -Watersoluble tin(IV) porphyrins are reduced by EDTA and visible light, first to give chlorins, then isobacteriochlorins. No isobacteriochlorin is formed in the presence of colloidal platinum, but hydrogen is produced. The conversion is about 25 moles of hydrogen per mole of porphyrin and hour. Isobacteriochlorins are dehydrogenated to give chlorins in the presence of colloidal platinum. The reaction takes place either in the air or under argon.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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