## 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__.
Concerning the chemical shifts of the ring protons of toluene as determined by 1H NMR spectroscopy of deuterated material
β Scribed by T. Schaefer; H. M. Hutton
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 133 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
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.
π 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
Three known bisabolane hydrocarbons, a-trans -bergamotene, sesquiphellandrene and zingiberene, were isolated from the aerial parts of Alpinia densibracteata . Their 1H and 13C NMR spectra were completely assigned by using a combination of 13C DEPT and 2D-NMR experiments (1H-1H COSY, single-bond 13C-
## Abstract The ^1^H CW offβresonance decoupled ^13^C NMR spectra of (__E__)β and (__Z__)βcycloalkenes (C~5~ο£ΏC~12~) were measured. The higher order ^13^C NMR multiplets obtained for the unsaturated carbons allow the determination of the vicinal ^1^H,^1^H coupling constant between the vinylic proton
## Abstract The isomeric tricyclo[4.4.1.1^2,5^]dodecanβ11βols have been synthesized from the (6+4) cycloaddition product of tropone with cyclopentadiene. The configuration and conformation of each isomer was determined from the proton shift gradients induced in the olefinic proton signals in the ^1