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- W2950894004 abstract "Abstract 5,6-Dihydroxyindoles 1 – 3 react readily with 1,4-naphthoquinone to give mainly deep-violet monoadducts identified as 8 – 10 by chemical and spectral analysis. When an excess of 1,4-naphthoquinone is used, a more complex reaction takes place leading to the dinaphthocarbazole 17 rather than the diadduct 11 , as previously reported. The same product ( 17 ) is also obtained by reaction of 2 with the 2,2'-dinaphthyl-1 ,4,1 ',4' -diquinone ( 18 ) in 30% yield. Interestingly, when 5,6-dihydroxyindoles are allowed to react with p-benzoquinone under similar conditions, no addition products are formed (UV and TLC evidence), owing to the tendency of the indoles to undergo oxidative coupling with formation, besides melanin-like products, of a complex mixture of oligomers. In the case of 2 , reduction and subsequent acetylation of the reaction mixture, has allowed the isolation of two oligomers, identified as 12 and 13 ." @default.
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- W2950894004 date "1987-10-20" @default.
- W2950894004 modified "2023-09-24" @default.
- W2950894004 title "ChemInform Abstract: A Reinvestigation of the Reactions Between 5,6-Dihydroxyindoles and Quinones." @default.
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- W2950894004 doi "https://doi.org/10.1002/chin.198742154" @default.
- W2950894004 hasPublicationYear "1987" @default.
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