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- Title
<sup>1</sup>H-NMR.-spektroskopische Analyse von prochiralen Allencarbonsäureestern mit optisch aktiven Europium-Verschiebungsreagenzien.
- Authors
Lang, Robert W.; Hansen, Hans-Jügen
- Abstract
1H-NMR. Spectroscopic Analysis of Prochiral Allenic Esters Using Optically Active Europium Shift Reagents The prochiral allenic methyl esters 1-4 (cf. Scheme) show in the presence of 1 mol-equiv. tris[3-(heptafluorobutyryl)-(+)-camphorato]europium (III) (Eu (hfc)3) in 1,1,2-trichloro-1,2,2-trifluoroethane (TCFE) induced unlike 1H-NMR. shift differences (ΔΔδ) for the enantiotopic protons and methyl groups on C(4), respectively ( cf. Fig. 2 and 3). This effect allows to determine directly the 2 JH,H coupling constants of the geminal protons on C(4) of the allenic esters 1 (15.5 Hz) and 2 (14.5 Hz) (cf. Table 2).
- Publication
Helvetica Chimica Acta, 1979, Vol 62, Issue 5, p1458
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.19790620510