The complete assignments of 1 H and 13 C signals of 19 pregnenolone and progesterone haptens were accomplished using twodimensional NMR techniques.
Total Assignment of the 1H and 13C NMR Chemical Shifts of Three Bisabolane Hydrocarbons by 2D-NMR Spectroscopy
β Scribed by Lai-King Sy; Geoffrey D. Brown
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 151 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
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-1H correlation, long-range 13C-1H correlation and INADEQUATE).
π SIMILAR VOLUMES
The 1H and 13C NMR resonances of four 3H-naphtho[2,1-b]pyrans were completely and unambiguously assigned by a combination of homonuclear (gs-COSY), 1H-detected heteronuclear one-bond (gs-HMQC) and long-range (gs-HMBC) gradient-selected correlation experiments.
H and 13C NMR chemical shifts and the homo-and heteronuclear coupling constants of 14 nitroxanthones are presented. Specific nitro increments for xanthones depending on substituent position and on the respective ring carbon position and shift additivity rules were developed by means of multiple line