界面活性剤の標準試料に関する研究-4-5,8-ジイソプロピル-2-ナフタレンスルホン酸カリウム中に共存する異性体不純物の定量

概要

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Quantitative determination of isomeric impurities contained in purified potassium 5, 8-diisopropyl-2-naphthalenesulfonate [KDNS] by means of NMR was investigated, after KDNS was converted to the methyl ester [MeDNS].<BR>GLC methods were unsuitable for determining the isomeric impurities because of peaks of MeDNS and the isomer, separated from a mixture of methyl esters derived from side reaction products on KDNS preparation, were overlapped each other. On the other hand, NMR spectra observed in the aromatic ring proton range were suitable for these determinations, and lower limits of determination on the isomers contained in MeDNS were estimated as 0.5mol%. As the results, it was recognized that the purified KDNS, which have been used hitherto in our studies, was of purity over 99.5mol% with respect to the isomers.
日本油化学会の論文