604-66-0Relevant academic research and scientific papers
Intermediates in the cleavage of endoperoxides
Bauch, Marcel,Klaper, Matthias,Linker, Torsten
supporting information, (2017/03/24)
The decomposition of anthracene endoperoxides has been investigated under various conditions. Thermolyses proceed via radical intermediates and afford anthracenes and rearrangement products, depending on the substitution pattern. Interestingly, not only the O–O but also the C–O bond can be cleaved homolytically. Under basic conditions fragmentations take place, affording anthraquinone, and reactive oxygen species. This mechanism explains the often observed decomposition of endoperoxides during work-up. Finally, an acid-catalyzed cleavage has been observed under release of hydrogen peroxide. The results should be interesting for the mechanistic understanding of peroxide decomposition and the endoperoxides might serve as mild sources of reactive oxygen species for future applications. Copyright
Process for the production of carboxylic acid esters of 9,10-dihydroxy anthracene
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Page 3; 4, (2010/02/07)
In einem Verfahren zur Herstellung von 9,10-Dihydroxyanthracencarbons?ureester und dessen Abk?mmlingen durch katalytische Oxidation von Anthracen wird Anthracen in der flüssigen Phase in einem Carbons?uremedium in Gegenwart eines organischen Metallsalzes und eines Aktivierungsmittels für das Metallsalz bei einer Temperatur von etwa 40 °C und mehr unter Einwirkung von Sauerstoff und Licht behandelt, der Niederschlag abgetrennt, der flüssige Rest mit Veresterungsmitteln behandelt und der erhaltene Ester aus dem Reaktionsgemisch isoliert.
Syntheses and reactions of spirocyclopropaneanthrones. Part 2. Rearrangements and cyclopropyl ring-opening reactions of phenyl-substituted spirocyclopropaneanthrones and related compounds
Hirakawa, Kiyoichi,Nosaka, Toshikazu
, p. 2835 - 2841 (2007/10/02)
Diphenylspirocyclopropaneanthrones [(1c) and (1d)] thermally rearranged with ring expansion to 1,10b-dihydro-2H-aceanthrones (2), whereas the phenyl analogue (1b) did not rearrange under comparable conditions. Phenylspirocyclopropeneanthrone (3a), prepared by the carbenic reaction of 10-diazoanthrone (6) with phenylacetylene, thermally rearranged to 10bH-aceanthrone (11). By contrast, the diphenyl analogue (3b), from the reaction with diphenylacetylene, was thermally stable. The diazoketone (6) reacted with 9-methylenefluorene to give directly the rearrangement product (2g), instead of the dispirocyclopropaneanthrone (1g). Spirocyclopropane-and spirocyclopropene-anthrones [(1) and (3)] reacted under acidic conditions to yield cyclopropyl or cyclopropenyl ring-opened products. In these reactions, the ring was shown to open from the more substituted side. These reactions are discussed in mechanistic terms.
