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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 724 (1969), S. 155-158 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1-(2- Hydroxyphenyl)-3,5-diphenyl-Δ2-pyrazolines2-Hydroxyphenylhydrazine hydrochlorides 1a-g and chalcone form 1-(2-hydroxyphenyl)-3,5-diphenyl-Δ2-pyrazolines (2a-g). The isolation of chalcone 2-hydroxyphenylhydrazones 3a and 3b depends on the substituents of the compounds 1a-g. - 1,3,5-Triphenyl-Δ2-pyrazolines show fluorescence, 1-(2-hydroxyphenyl)-3,5-diphenyl-Δ2-pyrazolines do not. Acetylation of the phenyl group leads to fluorescent compounds 4a-e.
    Notes: Aus den 2-Hydroxy-phenylhydrazin-hydrochloriden 1a-g, und Benzylidenacetophenon werden 1-[2-Hydroxy-phenyl]-3.5-diphenyl-Δ2-pyrazoline (2a-g) hergestellt. In Abhängigkeit von der Substitution der Verbindungen 1a-g, können bei gleichen Reaktionsbedingungen die Benzylidenacetophenon-2-hydroxy-phenylhydrazone 3a und 3b als Zwischenstufen isoliert werden. - Im Gegensatz zu 1.3.5-Triphenyl-Δ2-pyrazolinen fluoreszieren 1-[2-Hydroxyphenyl]-3.5-diphenyl-Δ2-pyrazoline nicht. Acetylierung der Hydroxyl-Gruppe führt zu fluoreszierenden Verbindungen 4a-e.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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