Zusammenfassung
Die Absorptionsspektren folgender Verbindungen: Chinoxalin, 2,2′-Dichinoxalyl, 2-Methylchinoxalin, 3,3′-Dimethyl-2,2′-dichinoxalyl, Pyrazin, 2,2′-Dipyrazyl, 2-Methylpyrazin und 5,5′-Dimethyl-2,2′dipyrazyl wurden in Methanol im Bereich von 225–360 nm bestimmt.
Eine Methode zur quantitativen Bestimmung der genannten Verbindungen wurde ausgearbeitet, um den Herstellungsprozeß von 2,2′Dichinoxalyl, 3,3′-Dimethyl-2,2′-dichinoxalyl, 2,2′-Dipyrazyl und 5,5′-Dimethyl-2,2′-dipyrazyl aus den entsprechenden Monomeren durch direkte Photometrierung von Proben der Reaktionsgemische, die in einem beliebigen Stadium der Synthese dem Reaktor entnommen wurden, verfolgen zu können.
Summary
The absorption spectra of the following compounds: quinoxaline, 2′,2-diquinoxalyl, 2-methylquinoxaline, 3,3′-dimethyl-2-2′-diquinoxalyl, pyrazine, 2,2′-dipyrazyl, 2-methylpyrazine and 5,5′-dimethyl-2,2′-dipyrazyl were determined in methanol in the region of 225–360 nm. A method was developed for the quantitative determination of these compounds in order to be able to follow the preparation methods of 2,2′-diquinoxalyl, 3,3′-dimethyl-2,2′-diquinoxalyl, 2,2′-dipyrazyl and 5,5′-dimethyl-2,2′-dipyrazyl from the corresponding monomers through direct photometration of samples of the reaction mixture, which can be taken from the reactor at a selected stage of the synthesis.
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Gregorowicz, Z., Baranowska, I., Karmiński, W. et al. Spektrophotometrische Bestimmung von Dehydrokondensationsprodukten der Pyrazine und Chinoxaline. Mikrochim Acta 60, 503–511 (1972). https://doi.org/10.1007/BF01217955
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DOI: https://doi.org/10.1007/BF01217955