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Use of silver trifluoroacetate together with lanthanide shift reagents for simplification of 1 H NMR spectra of aromatic hydrocarbons
Author(s) -
Da̧mbska Anna,
Janowski Andrzej
Publication year - 1980
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270130213
Subject(s) - ethylbenzene , benzene , reagent , toluene , lanthanide , chemistry , xylene , nmr spectra database , proton nmr , proton , spectral line , inorganic chemistry , photochemistry , organic chemistry , ion , physics , astronomy , quantum mechanics
The equimolar mixtures of typical lanthanide shift reagents such as Eu(fod) 3 , Pr(fod) 3 or Yb(fod) 3 with silver trifluoroacetate, previously used to induce paramagnetic shifts in the 1 H NMR spectra of alkenes, have been successfully applied to simple aromatic hydrocarbons such as benzene, toluene, ethylbenzene and xylenes. In benzene and p ‐xylene the signals of all the aromatic protons are shifted identically. In other substituted benzenes the magnitude of the induced shift depends on the distance between the proton and the substituents. In addition, the different behaviour of the signals of the methyl groups in meta ‐and para ‐xylene on the addition of the complex shift reagent allows the quantitative analysis of the two xylenes in their mixtures.