✦ LIBER ✦

The conformation of cyclic ketones. Solvent shifts in NMR.

✍ Scribed by T. Ledaal

Publisher: Elsevier Science
Year: 1968
Tongue: French
Weight: 277 KB
Volume: 9
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)75604-8

No coin nor oath required. For personal study only.

✦ Synopsis

Recently new indications for the existence of preferred, distinct orientations of the carbonyl group in 3-12-membered cycloalkanones was found by the present author'. The orientation of the carbonyl group seemed to change in an irregular vay within the series, indicating a preferred orientation ror each ring size. Some of the results closely paralleled the c13RMR measurements of Dahmi and St&hers 2 .

📜 SIMILAR VOLUMES

Pyridine solvent shifts in the nmr analy

Pyridine solvent shifts in the nmr analysis of erythromycin aglycones

✍ Paul V. Demarco 📂 Article 📅 1969 🏛 Elsevier Science 🌐 French ⚖ 251 KB

The NMR spectra and conformations of cyc

The NMR spectra and conformations of cyclic compoundsV: Proton couplings and chemical shifts in bridged cyclobutanes

✍ R. J. Abraham; M. A. Cooper; J. R. Salmon; D. Whittaker 📂 Article 📅 1972 🏛 John Wiley and Sons 🌐 English ⚖ 948 KB

## Abstract The PMR spectra of twelve pinene derivatives are reported, analysed and assigned. The proton couplings in the bridged cyclobutane group are compared with those of other strained cyclobutanes, and the relationship between ^2^__J__~HH~ and the C.CH~2~.C angle is shown to be anomalous in

Standardization of chemical shifts of TM

Standardization of chemical shifts of TMS and solvent signals in NMR solvents

✍ Roy E. Hoffman 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 212 KB

## Abstract The standard for chemical shift is dilute tetramethylsilane (TMS) in CDCl~3~, but many measurements are made relative to TMS in other solvents, the proton resonance of the solvent peak or relative to the lock frequency. Here, the chemical shifts of TMS and the proton and deuterium chemi

Studies on cyclic peptides. III. The spe

Studies on cyclic peptides. III. The specific interaction of cyclic peptides with benzene and an application of the solvent-induced nmr shift to the conformational analysis of cyclo-(Pro-Sar-Gly)2

✍ Toshiharu Sugihara; Yukio Imanishi; Toshinobu Higashimura 📂 Article 📅 1975 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 661 KB

The interaction between cyclic peptides [cyclo-(Sara), cyclo-(Pro-Sar-Gly)r, cyclo-(Sar-Sar), and cyclo-(Sar-Gly)] with benzene has been investigated by nmr spectroscopy. The experiment with cyclo-(Sarr) showed that benzene int,eracted preferentially with the frans peptide bond in a similar manner t

The solvent-induced shift in the proton

The solvent-induced shift in the proton NMR of some quinolizidine substituents

✍ Robert T. Lalonde; Thomas N. Donvito; Amy I-M. Tsai; Chunfook Wong 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 English ⚖ 240 KB

## Abstract The proton chemical shift values for the methyl groups in the nine monomethylquinolizidines are determined in deuterochloroform and benzene solutions. This solvent change results in the shielding of all the methyl groups except those in 1(a)‐and 3(a)‐methylquinolizidine which become des

The conformation of griseofulvin. Applic

The conformation of griseofulvin. Application of an nmr shift reagent

✍ Samuel G. Levine; Ronald E. Hicks 📂 Article 📅 1971 🏛 Elsevier Science 🌐 French ⚖ 196 KB

In continuation of previous stereocherical studies1 in the griseofnlvin series we have uw found evidence that the preferred conformation in stereostructure I. Our conclusiou is based 3