The stereochemistry of 1,Z-disubstituted fluoroethylenes, of general formula RCH,CH=CFR', has been ascertained from the different magnitudes of the upfield shift effect promoted by fluorine on the "C NMR absorptions of the underlined y-carbon of the fluorinated analogue in comparison with those of t
β¦ LIBER β¦
Confirmation of the C-1 stereochemistry of ginkgolides by NMR
β Scribed by Teris A. van Beek; Peter P. Lankhorst
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- French
- Weight
- 470 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0040-4020
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## Abstract The stereochemistry of various pairs of isomeric 2βcyclohexenβ1βylidenecyanoacetates was assigned using ^1^H NMR spectroscopy. The isomers with the Ξ³βmethylene or the Ξ³βvinyl protons __cis__ to the carbalkoxy group were found to have the signals of these protons at approximately 0.3 ppm