## Abstract The ^13^C n.m.r. spectrum of benzofuroxan at β15Β°C is assigned on the basis of selective decoupling experiments and by comparison with the ^13^C chemical shifts of model compounds. The ^13^C spectra were also measured in trifluoroacetic acid as a solvent. From the temperature dependence
13C NMR spectra of wedeloside and related kaurenoid derivatives
β Scribed by I. A. S. Lewis; J. K. MacLeod
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 453 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
The ^13^C NMR spectra of the diterpenoid aminoglycoside wedeloside and certain of its derivatives, representatives of a new kaurenoid series, have been assigned. Shift calculations and labelling experiments have established a general substituent additivity relationship for chemical shifts in kaurβ16βenes which allowed the reassignment of certain ^13^C resonances in the previously reported spectra of other kaurβ16βenes.
π SIMILAR VOLUMES
## Abstract The ^13^C NMR spectral data of 18 eudesmane derivatives, mainly acids and esters of natural and synthetic origin, are reported, and the Ξ³βeffect of the epoxide ring in two diastereoisomeric epoxy esters is discussed.
The carbon-13 chemical shifts of mono-and 1,3-disubstituted adamantanes are reported. The effects caused by the substituents are compared with those met in aliphatic and alicyclic compounds. It is shown that the 1,4-interactions have only minor importance in 1-substituted adamantanes. The influence
## Abstract Eight alkylcyclopropane derivatives were prepared in a conventional manner and analysed by ^13^C NMR spectroscopy. Additivity parameters were calculated from the chemical shifts of the endocyclic carbons, and the configurational structures derived for these compounds are confirmed by th