## Abstract Chemical shifts for tritons in __ortho__, __meta__ and __para__ positions in toluene have been determined using a 64 MHz tritium NMR spectrometer. The order of shift is __meta__>__para__>__ortho__, whereas the calculated shift order for protons is __meta__>__ortho__>__para__.
Chemical shifts for tritons in chlorobenzene, bromobenzene, fluorobenzene and toluene as determined by tritium NMR spectroscopy
โ Scribed by Mervyn A. Long; Christopher A. Lukey
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 214 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0749-1581
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โฆ Synopsis
Abstract
Chemical shifts for tritons in chlorobenzene have been measured in the pure compound and in a dilute solution in cyclohexane using a 64 MHz NMR spectrometer. The order of shifts is o>m>p. Triton shifts in pure bromobenzene, fluorobenzene and toluene have also been measured and the influence of CCl~4~ solvent on the aromatic triton shifts in toluene explored. Complete resolution of the three aromatic triton positions is achieved in pure toluene, but the ortho and para shifts are not resolved in 25% solution in CCl~4~.
๐ SIMILAR VOLUMES
Chemical shifts for the aromatic tritons of toluene decrease in the order meta > para > ortho for pure toluene, but in the order meta>ortho>para for dilute solutions of toluene in carbon tetrachloride, chloroform, cyclohexane and dimethyl sulphoxide; m-xylene shifts are 5>4,6>2 in the pnre state and
## Abstract Chemical shifts of the ring protons are determined by ^1^H NMR of 99% deuterated toluene. At low temperatures the deuterons relax rapidly, yielding sharp ^1^H peaks for the __ortho__, __meta__ and __para__ protons. These are compared with shifts obtained by other methods.