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Determination of 2,4-dichlorophenol in dichlorophenol isomers by NMR

✍ Scribed by Naohumi Esumi; Teruo Suzuki; Shoichi Hayashi

Publisher
John Wiley and Sons
Year
1970
Tongue
English
Weight
340 KB
Volume
2
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Quantitative analysis of isomers by NMR has been carried out in the measurement of species whose components present simple and sufficiently isolated spectra. Generally, the substituted aromatic proton splits into complicated spectral lines due to spin‐spin coupling. The ring proton spectra of dichlorophenol isomers show a pattern peculiar to the three spin system. It was found that some of the signal attributable to these compounds appear in a position slightly isolated from each other. Therefore, we established the quantitative analysis method for dichlorophenol, using the signal intensity method. From the result of the quantitative analysis, the lowest detectable concentration was 1·1% (±0·3% at the standard deviation). The accuracy of the peak intensity method was found to be ±1·8% within the 50 to 80 mol% concentration range of 2,4‐dichlorophenol isomer.

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