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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 98 (1967), S. 324-328 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract The synthesis of some substituted indigos according to a recently developed method is described.
    Notes: Zusammenfassung Die Synthese einiger einfach substituierter Indigoderivate nach einem kürzlich entwickelten Verfahren wird beschrieben.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract The synthesis of polymeric indigos (PI) according to the procedure ofZiegler andKappe 2, 3 is described. Starting with benzidine (1 a) or tolidine (1 b) thePI 6 a and6 b, resp., are obtained. In a similar way the N,N′-bridgedPI 12 is synthesized from tetrahydroquinoxaline (7).
    Notes: Zusammenfassung Die Darstellung von polymeren Indigofarbstoffen (PI) nach dem Verfahren vonZiegler undKappe 2, 3 wird beschrieben. Ausgehend von Benzidin (1 a) und Tolidin (1 b) erhält man so diePI 6 a bzw.6 b. In analoger Weise wird aus Tetrahydrochinoxalin (7), der N,N′-überbrücktePI 12 gewonnen.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 97 (1966), S. 409-416 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract o-Aminophenylglyoxal-dimethylacetal (1) has been condensed with several cyclic ketones, acetophenones, and with acetone to yield derivatives of quinoline-4-aldehyde.1 reacts with ethyl acetoacetate and diethyl malonate at 160° yielding 3-acetyl-(11) and 3-carbethoxy-4-dimethoxymethyl-carbostyril (12) respectively. o-Acetaminophenylglyoxal dimethyl acetal (21) undergoes ring closure to carbostyril-4-aldehyde dimethyl acetal (22), when treated with sodium ethoxide; the reaction of21 with ethyl cyanoacetate leads to 3-cyano-4-dimethoxymethyl-carbostyril (24).
    Notes: Zusammenfassung o-Aminophenylglyoxal-dimethylacetal (1) läßt sich mit Carbonylverbindungen, die eine α-Methylengruppe enthalten, im Sinne einerFriedländer-Synthese zu Derivaten des Chinolin-4-aldehyds umsetzen. Bei 150–160° reagiert1 mit Acetessigester und Malonester unter Bildung des 3-Acetyl-(11) bzw. 3-Car-bäthoxy-4-dimethoxymethyl-carbostyrils (12). o-Acetaminophenylglyoxal-dimethylacetal (21) kann mit Na-Äthylat zum Carbostyril-4-aldehyd-dimethylacetal (22) cyclisiert werden; mit Cyanessigester kondensiert sich21 zum 3-Cyan-4-dimethoxy-methyl-carbostyril (24).
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