The enantiomeric purity of several tobacco alkaloids and nicotine-like compounds was determined using 'H NMR (300 MHz) spectroscopy in the presence of (-)-(R)l,l'-binaphthyl-2,2'-diylphosphoric acid (BNPPA) as a chiral complexing agent. The most significant signal splitting resulting from diastereoi
Determination of Rate of Internal Rotation by 1H-NMR Spectroscopy in the Presence of Optically Active Auxiliary Compounds
β Scribed by Prof. Dr. Albrecht Mannschreck; Dr. Violet Jonas; Dr. Bernd Kolb
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 196 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0044-8249
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It was found that the oxirane ring is a functional group amenable to chiral discrimination by dirhodium-MTPA complexes. Considerable signal shifts up to 0.7 ppm are observed for 1 H nuclei close to the rhodium atoms in the complex. In analogy to previously reported olefins, this method appears to be
The 1H NMR spectra of a variety of chiral racemic nitriles were recorded in in the absence CDCl 3 and presence of dirhodium tetra-(R)-a-methoxy-a-(triΓuoromethyl)phenylacetate MTPA 4 MosherΓs [Rh 2 (MTPA) 4 ; acid]. Moderate 1H signal shifts but clear diastereomeric dispersions due to complexation w
The trisaccharide b-d-Glcp-(1 3 2)-b-d-Glcp-(1 3 3)-a-d-Glcp-OMe has been investigated by molecular dynamics (MD) simulations and NMR experiments in water. 13 C spinlattice (T 1 ) and spin Β± spin (T 2 ) relaxation times, together with 1 H, 13 C NOE data were measured at two magnetic field strengths