𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Application of NMR spectroscopy of chiral association complexes. 14—chiral recognition of terpene and cyclohexene hydrocarbons by 1H and 13C NMR

✍ Scribed by Werner Offermann; Albrecht Mannschreck

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
755 KB
Volume
22
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Chiral NMR recognition of terpenic and similar hydrocarbons by Ag(fod) and optically active lanthanide shift reagents is descnloed. Twenty-four 'H signals of eight compounds and, as a first report in the literature, eleven I3C signals of three compounds were split into signal pairs due to the respective enantiomers. Although the magnitudes of the splittjngs are not connected to the structnre of the substrate molecules in an obviouS manner, the con6gwathns of the similar compounds camphene and epi-b-santalene were related empirically. AU spectra were sdiaently resolved to allow separate integration of enantiomer signals; from the integrals the enantiomeric purities of seven non-racemic mixtures were determined with good accuracy. The shift curves made several hitherto unknown assignments feasible.

📜 SIMILAR VOLUMES

Chiral recognition of epoxides by 1H NMR
Chiral recognition of epoxides by 1H NMR spectroscopy in the presence of a chiral dirhodium complex
✍ Klaudia Wypchlo; Helmut Duddeck 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 46 KB 👁 2 views

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

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 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 250 KB 👁 2 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-(triÑuoromethyl)phenylacetate MTPA 4 MosherÏs [Rh 2 (MTPA) 4 ; acid]. Moderate 1H signal shifts but clear diastereomeric dispersions due to complexation w

Applications of NMR spectroscopy of chir
Applications of NMR spectroscopy of chiral association complexes 5. Stereodynamics and diastereotopism in chiral 1,3-dienes
✍ Georg Becher; Thomas Burgemeister; Hans-Helmut Henschel; Albrecht Mannschreck 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 484 KB

The barriers to partial rotation around the central single bond in chiral dieties HOCMe2(CCI=CC&X have been determined by coalescence of either 'H NMR signals (X=CH,OCH,) or 13C NMR signals (X=H). In the presence of the optically active shift reagent (+)-Eu(hfbc), all ' H signals were split at tempe

Application of cyclodextrins to chiral a
Application of cyclodextrins to chiral analysis by 1H NMR spectroscopy
✍ A. F. Casy; A. D. Mercer 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 700 KB

The influence of inclusion complex formation between cyclodextrins (chiefly the 8-polymer) and a variety of chiral antihistaminic and analgesic agents on the 'H NMR features of both guest and host partners is reported. In many cases equivalent protons of antipodes give resonances which differ in che

ChemInform Abstract: Chiral Recognition
ChemInform Abstract: Chiral Recognition of Amino Alcohols by 1H and 13C NMR Spectroscopy Using Binaphthyl Derivatives as Chiral Solvating Agents.
✍ C. KOY; M. MICHALIK; C. DOEBLER; G. OEHME 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 34 KB 👁 2 views

Chiral Recognition of Amino Alcohols by 1 H and 13 C NMR Spectroscopy Using Binaphthyl Derivatives as Chiral Solvating Agents. -Different signals in the spectra are doubled in dependence on the substrate as well as the agent. In the 1 H NMR spectra mainly the CH 3 N signal is a useful indicator in