Careful analysis of the 1H and 13C NMR spectra of a series of isochromanylacetylarylhydrazone derivatives indicated the diastereomeric selective character in the synthetic step used to obtain the derivatives employing acidic conditions during the condensation of the corresponding acylhydrazides with
1H and 13C NMR of acetyl derivatives of shamimin, a flavonol-C-glycoside
β Scribed by Shaheen Faizi; Muhammad Ali
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 60 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
β¦ Synopsis
On acetylation, shamimin (1) a new flavonol-C-glycoside, furnished the penta-, hepta-and octaacetates, 5, 4 and 2, 3 respectively. Compound 2 hydrolysed into the tetraacetate 6 whereas 3 and 4 converted into 5 at room temperature. 1 H and 13 C NMR assignments are described.
π SIMILAR VOLUMES
The 1H and 13C chemical shifts of four apocampholenic aldehydes and the corresponding alcohols are reported. 1998 John ( Wiley & Sons, Ltd.
A series of acetonides was obtained during the formal synthesis of deoxynojirimycin. The 1 H NMR spectra of these derivatives contain strongly coupled multiplets covering a chemical shift range of about 1 ppm. The spectra are severely complicated by second-order effects and were assigned by 2D NMR a
The 1 H and 13 C NMR resonances of 12 tetracyclic phenothiazine derivatives were completely and unequivocally assigned by the concerted application of 1 H-detected heteronuclear one-bond (gs-HMQC) and long-range (gs-HMBC) gradient selected correlation experiments. 1 H and 13 C chemical shifts are al