Application of paramagnetic shift reagents to phenolic systems in proton nuclear magnetic resonance spectrometry

Abstract

The inflection of the calibration curve, usually attributed to adsorption in the column, may depend upon an incorrect use of the gas sampling device. Sensitivity and reliability of the method are definitely competitive with those of other instrumental and manual methods of monitoring.The apparatus described in this paper was assembled in such a way that now it is in use for field measurements and occupies a total volume, including gas cylinders, of 0.25 m3.

Organic analytical reagents in nuclear magnetic resonance spectroscopy

“…Since LSR5 have the ability to separate overlapping signals from the components of mixtures, it is possible to exploit very small differences in this way, an interesting example being the use of Eu(fod)3 in the quantitative analysis of mixtures of cresol isomers [15].…”

Functional group analysis

“…Europium shift reagents have been applied to the NMR determination of mixtures containing phenols and cresols (71,82). A mixture of 1-and 2-naphthols can be analyzed by NMR by using an acetone solution containing 100 ppm of Cr03 (75).…”

Quantitative analysis of a mixture of cresols by carbon‐13 NMR spectroscopy

“…Quantitative analyses of these isomers in their mixtures have been carried out both with a chemical method' and with physical methods such as GC,24 UV,' IR6 and 1HNMR. [7][8][9] The absolute errors of these methods were from 2.4 to 1.3%. In 'H NMR the resolution of the methyl peaks, on which the quantitative analysis of the three cresol isomers is based, depends on the concentration of each creso17 and of the sodium hydroxide in the solution and also on the solvent system.…”