Recently the use of two new shift reagents, Eu(fod)3 and Pr(fod)3, have been reported by Rondeau and Sievers. \* The advantage of these as shift reagents is due to their relatively high solubility in nonalcholic solvents and to the fact that neither Eu(fod)3
Investigation of the spatial structure of the sesquiterpene lactone hanphyllin by1H NMR spectroscopy using the shift reagent Eu(FOD)3
β Scribed by B. F. Rasulev; M. G. Levkovich; N. D. Abdullaev
- Publisher
- Springer
- Year
- 1995
- Tongue
- English
- Weight
- 282 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0009-3130
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## 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
An assignment of relative configurations has been achieved for the diastereomeric racernates(lR2R,lS2S) and (1R2S, 1S2R) of 3,3-dimethyl-l,2-diphenylbuta~-l-ol through the comparative analysis of the respective chemical shifts induced by Eu(fod), in the 'H and '"C NMR spectra, and the corresponding