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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1043-1057 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemistry of Aromatic Nitro Compounds, III. On the Mechanism of Light-Induced Formation of 1-Hydroxy-3.3-dimethyl-2(3H)-indolones from o-Nitro-tert-butylbenzenesIrradiation of o-nitro-tert-butylbenzenes 1a-e followed by alkaline and oxidative workup affords 1-hydroxy-3.3-dimethyl-2(3H)-indolones 2a-e, whereas 4-amino-2-nitro-tert-butylbenzene (1f) is photostable. The photolysis of model compound 1b in several solvents is investigated. Spectroscopic data and the sensitisation by benzophenone suggest that the lowest triplet of 1b with n-π*-character is the reactive species. The quantum yield for the formation of product 2b from 1b is (1.2 ± 0.1) × 10-2 mmoles/mEinstein. A reaction mechanism accounting for all products found is suggested.
    Notes: Die Photolyse der o-Nitro-tert.-butylbenzole 1a-e liefert bei alkalisch-oxydativer Aufarbeitung die 1-Hydroxy-3.3-dimethyl-3H-indolone-(2) 2a-e, während 2-Nitro-4-amino-tert.-butylbenzol (1f) photostabil ist. Die Modellsubstanz 1b wird in verschiedenen Lösungs-mitteln belichtet. Spektroskopische Befunde und die Sensibilisierung durch Benzophenon legen nahe, daß der unterste angeregte Triplettzustand von 1b mit n-π*-Charakter für die Reaktion verantwortlich ist. Die Quantenausbeute für die Bildung des Produktes 2b aus 1b beträgt (1.2 ± 0.1) × 10-2m Mol/mEinstein. Ein Reaktionsmechanismus, der alle gefundenen Produkte berücksichtigt, wird vorgeschlagen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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