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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 377-387 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Anthraquinones and their Reduction Products, IV. Studies on the Reaction of Anthrahydroquinones with FormaldehydeMeasurements by direct current polarography showed, that substituted anthrahydroquinones can react with formaldehyde to 10-hydroxy-1-0(hydroxymethyl)-9-anthrones in a reversible reaction. Some of these instable compounds have been isolated and their structures have been determined.
    Notes: Gleichstrompolarographische Messungen zeigten, daß substituierte Anthrahydrochinone mit Formaldehyd in wäßrigem Äthanol im pH-Bereich 7-14 in einer reversiblen Gleichgewichtsreaktion zu 10-Hydroxy-10-hydroxymethyl-anthronen-(9) reagieren können In einzelnen Fällen konnten diese sehr labilen Verbindungen isoliert und ihre Struktur bestimmt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1062-1071 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Anthraquinones and their Reduction Products, V Studies on the Methylation, Hydroxymethylation, and Aminomethylation of AnthraquinonesAs intermediate of the methylation reaction of 1-aminoanthrahydroquinone with formaldehyde 1-amino-2-(hydroxymethyl)anthrahydroquinone (4) is proved. It was found further, that nucleofugic leaving groups in position-2 of 1-aminoanthraquinones were replaced by hydroxymethyl (2) or aminomethyl groups (e. g. 8a-d) on reaction with formaldehyde or formaldehyde/primary and secondary aliphatic amines and sodium dithionite as reducing agent.
    Notes: Bei der Methylierung von 1-Amino-anthrahydrochinon mit Formaldehyd wurde 1-Amino-2-hydroxymethyl-anthrahydrochinon (4) als Zwischenstufe nachgewiesen. Durch nucleofuge Abgangsgruppen in 2-Stellung substituierte 1-Amino-anthrachinone reagieren mit Formaldehyd bzw. Formaldehyd/primären und sekundären Aminen und Natriumdithionit als Reduktionsmittel zu 2-Hydroxymethyl- (2) bzw. 2-Aminomethyl-substituierten 1-Amino-anthrachinonen (z. B. 8a-d).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 972-987 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Anthraquinones, VI. - Hydroxymethylation und Aminomethylation of AnthraquinonesI-Hydroxy- and 1-aminoanthrahydroquinones react in an alkaline medium with formaldehyde or formaldehyde/aliphatic amines to give 2-hydroxymethyl- or 2-aminomethyl-substituted 9,lO-dihydroxyanthracenes which undergo an intramolecular redox reaction to yield the corresponding methyl-substituted anthraquinones. If the reaction is interrupted by oxidation, (hydroxymethy1)- or (aminomethy1)anthraquinones e. g. 1a - h or 2a - f can be isolated. The nucleofugic leaving group -SO3H in 2-position of 1-hydroxy- and 1-aminoanthraquinones is replaced by hydroxymethyl or aminomethyl e. g. 1a,e,i,j or 2a- j on reaction with form- aldehyde or formaldehyde/aliphatic amines and sodium dithionite as reducing agent.
    Notes: 1 -Hydroxy- und 1-Aminoanthrahydrochinone reagieren im alkalischen Medium mit Formaldehyd oder Formaldehyd/aliphatischen Aminen zunächst zu 2-hydroxymethyl- bzw. 2-amino- methylsubstituierten 9,10-Dihydroxyanthracenen, die durch eine intramolekulare Redox- reaktion in die entsprechenden methylsubstituierten Anthrachinone übergehen. Unterbricht man die Reaktion vorzeitig durch Oxidation, so lassen sich die (Hydroxymethy1)- bzw. (Aminomethy1)anthrachinone wie z. B. 1a - h bzw. 2a- f isolieren. I-Hydroxy- und 1-Amino- anthrachinone mit der nucleofugen Abgangsgruppe -SO3H in 2-Stellung reagieren mit Formaldehyd oder Formaldehyd/aliphatischen Aminen und Natriumdithionit als Reduktions- mittel ebenfalls zu (Hydroxymethy1)- bzw. (Aminomethy1)anthrachinonen wie z. B. 1a,e,i,j bzw. 2a- j.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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