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.
Assignment of 1H and 13C NMR Chemical Shifts of Nitroxanthones and Development of Additivity Rules
β Scribed by W. Ibrom; A. W. Frahm
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 422 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
β¦ Synopsis
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 linear regression analysis.
π SIMILAR VOLUMES
The 1 H and 13 C chemical shifts of N-methylpiperidine betaines (1), C 5 H 10 N C CH 3 CH 2 n COO , and their derivatives C 5 H 10 N C CH 3 CH 2 n COOHΓX (2) and C 5 H 10 N C CH 3 CH 2 n COOC 2 H 5 ΓX (3) with n D 1-5 were identified using two-dimensional homonuclear ( 1 H) chemical shift correlatio
1 H and 13 C NMR spectral data for phytochelatin, NH 3 C --Glu-Cys 2 -Gly-COO , were assigned by a combination of one-( 1 H, 13 C) and two-dimensional (DQF-COSY, CH-COSY, HMBC) NMR experiments.
The indole alkaloid strychnobrasiline was studied using one-and two-dimensional NMR techniques. The interpretation of these spectra led to the complete assignments of all carbon and proton chemical shifts.
The complete assignment of the 1H and 13C NMR spectra of eight thienyl-substituted chromenes was achieved by the concerted application of homonuclear (gs-COSY), 1H-detected heteronuclear one-bond (gs-HMQC) and long-range (gs-HMBC) gradientselected correlation experiments.