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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2238-2244 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Synthesis of 7, 8, 9,10-Tetrahydrocyclohept[b]indol-6(5H)-onesp-Benzoquinone (5a) and methyl-p-benzoquinone (5b) reacts with N-aryl- and N-alkyl derivatives (4a-f) of 2-(aminomethylene)cyclohexanone to yield 2-hydroxy-5-alkyl- or -aryl-cyclohept-indol-6(5H)-ones 6a-j, the structure of which is proved by spectroscopic and chemical methods. A pathway for the reaction is given. By Fischer Cyclisation of the phenylhydrazone cyclohepta[2,1-b:3,4-b′]diindole 16 is prepared from 6h.
    Notes: p-Benzochinon (5a) und Methyl-p-benzochinon (5b) wurden mit N-Aryl- und N-Alkyl-monosubstituierten 2-(Aminomethylen)cyclohexanonen 4a-f umgesetzt. Die 2-Hydroxy-5-alkyl- bzw. -aryl-cyclohept-indol-6(5H)-on-Struktur 6a-j der Reaktionsprodukte wird spektroskopisch und chemisch bewiesen und ein Reaktionsverlauf angegeben. Durch Fischer-Cyclisierung eines Phenylhydrazons von 6h gelingt die Darstellung des Cyclohepta[2,1-b:3,4-b′]diindols 16.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 152-158 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of 2-(Aminomethylene)cyclohexanone Derivatives with DichloroquinonesReaction of dichloro-p-benzoquinones 1 with 2-[(arylamino)methylene]cyclohexanone derivatives 2 yield dibenzofuranone derivatives 4. The structure is proven spectroscopically and by oxidation to 6, which is hydrolysed to 7. The course of the reaction via the intermediate 10 can be proved by its isolation and reaction to 4a.
    Notes: Durch Umsetzung von Dichlor-p-benzochinonen 1 mit 2-[(Arylamino)methylen]cyclohexanon-Derivaten 2 werden die Dibenzofuran-Abkömmlinge 4 erhalten. Ihre Struktur wird spektroskopisch belegt und durch Oxidation zu 6 sowie anschließende Hydrolyse zu 7 chemisch bewiesen. Der Verlauf der Reaktion über das Zwischenprodukt 10 kann durch dessen Isolierung und Umsetzung zu 4a bewiesen werden.
    Additional Material: 7 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 209-212 
    ISSN: 0009-2940
    Keywords: Nenitzescu reaction ; Phenoxazine derivatives ; Ring-chain tautomerism ; Enaminone protonation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigation on the Formation of 6-Hydroxyindole in the Nenitzescu Reaction, I Nucleophilic Addition to N-QuinonlyenaminonesN-Quinonyl-enaminone 6 is synthesized. Its transformation into 6-hydroxyindole 5 fails. Thus, structure 6 is no intermediate in the formation of 5 from 1 and 2. Nucleophilic attack of trifluoroacetate on enaminone 6 yields hydroquinone 9a, which is hydrolysed to 10a, b. The structures of 9a and 10a, b are proven spectroscopically and by oxidation of 10b to 11, being equilibrated with phenoxazine 12. The latter is reduced to 13a, b.
    Additional Material: 1 Tab.
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