𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Chiral recognition of epoxides by 1H NMR spectroscopy in the presence of a chiral dirhodium complex

✍ Scribed by Klaudia Wypchlo; Helmut Duddeck

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
46 KB
Volume
9
Category
Article
ISSN
0899-0042

No coin nor oath required. For personal study only.

✦ Synopsis

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 comparable to the use of chiral lanthanoid shift reagents.

πŸ“œ SIMILAR VOLUMES

Chiral recognition of nitriles by 1H NMR
Chiral recognition of nitriles by 1H NMR spectroscopy in the presence of a chiral dirhodium complex
✍ Shahid Hameed; Roshan Ahmad; Helmut Duddeck πŸ“‚ Article πŸ“… 1998 πŸ› John Wiley and Sons 🌐 English βš– 250 KB πŸ‘ 1 views

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-(triΓ‘uoromethyl)phenylacetate MTPA 4 MosherÏs [Rh 2 (MTPA) 4 ; acid]. Moderate 1H signal shifts but clear diastereomeric dispersions due to complexation w

Benzoylated and Benzylated Cyclodextrins
Benzoylated and Benzylated Cyclodextrins: A New Class of Chiral Solvating Agents for Chiral Recognition of 3,5-Dinitrophenyl Derivatives by 1H-NMR Spectroscopy
✍ Gloria Uccello-Barretta; Angela Cuzzola; Federica Balzano; Rita Menicagli; Piero πŸ“‚ Article πŸ“… 1998 πŸ› John Wiley and Sons 🌐 English βš– 279 KB πŸ‘ 1 views

Benzoylated and benzylated cyclodextrins give rise to non-spectroscopy. Cyclodextrins bearing aromatic substituents at the primary or secondary sites only are more efficient CSAs equivalence in the 1 H-NMR spectra of racemates of 3,5dinitrophenyl derivatives of chiral amines, amino alcohols, compare

Chiral purity determination of tobacco a
Chiral purity determination of tobacco alkaloids and nicotine-like compounds by 1H NMR spectroscopy in the presence of 1,1β€²-binaphthyl-2,2β€²-diylphosphoric acid
✍ Alain Ravard; Peter A. Crooks πŸ“‚ Article πŸ“… 1996 πŸ› John Wiley and Sons 🌐 English βš– 481 KB πŸ‘ 1 views

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