the help of glycosyl transferases in a stereospecific manner without protecting group manipulations.138\* 391 Thus SLe' mimeti c ~, ' ~' ] some of them showing surprisingly high affinities to E-sel e ~t i n , ' ~' ~ may be accessible easily.
Chiral recognition by 1H-NMR, EPR, and ENDOR spectroscopy
✍ Scribed by Prof. Dr. Hartmut B. Stegmann; Manfred Mäurer; Ulrike Höfler; Klaus Scheffler; Frank Hewgill
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 366 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0899-0042
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
The question regarding chirality in nitroxides was rigorously investigated, namely, (a) are multiple EPR and ENDOR spectra expected from nitroxides with chiral centers, (b) which structures provide multiple structures and (c) under what conditions (temperature and solvent) are they obtained. It is s
tinued for 36 h. The clear bright yellow solution was filtered, and, after removal of solvent, the residue (2) was recrystallized from SO2; yield 2.3 g (86%,).
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-(triÑuoromethyl)phenylacetate MTPA 4 MosherÏs [Rh 2 (MTPA) 4 ; acid]. Moderate 1H signal shifts but clear diastereomeric dispersions due to complexation w