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Journal ArticleDOI

Nuclear magnetic resonance spectroscopy. Carbon-13 chemical shifts in cycloalkanones

Frank J. Weigert, +1 more
- 01 Mar 1970 - 
- Vol. 92, Iss: 5, pp 1347-1350
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TLDR
In this paper, simple additivity relationships were found which enable reasonable prediction of the chemical shifts of alkyl-substituted cyclohexanones, and attempts have been made to assign conformations to the higher cycloalkanones on the basis of their chemical shifts.
Abstract
High-resolution ^(13)C nuclear magnetic resonance spectra have been obtained of a number of cycloalkanones. Simple additivity relationships were found which enable reasonable prediction of the chemical shifts of alkyl-substituted cyclohexanones. Attempts have been made to assign conformations to the higher cycloalkanones on the basis of their ^(13)C chemical shifts.

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Journal ArticleDOI

Conformational analysis—LXXIX

TL;DR: In this article, the force field method has been extended to allow the calculation of structures and energies of molecules containing aldehyde or ketone groups, and a comparison of these values to strain energies in the hydrocarbon series is discussed.
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Carbon‐13 NMR spectra of some tetra‐ and pentacyclic triterpenoids

TL;DR: In this article, the carbon-13 NMR spectra of tetra-and pentacyclic triterpenoid spectra have been obtained for methyl, methylene, methine and quaternary carbon atoms.
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A Practical Method for Alcohol Oxidation with Aqueous Hydrogen Peroxide under Organic Solvent- and Halide-Free Conditions.

TL;DR: In this paper, a catalytic system consisting of sodium tungstate and methyltrioctylammonium hydrogensulfate effects oxidation of simple secondary alcohols to ketones using 3-30% H2O2 without any organic solvents.
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Carbon-13 NMR Spectra of Carotenoids

TL;DR: In this paper, the 13C-NMR spectrum of β-carotene has been assigned using data from deuterium labelled samples, and cis vitamin A. A study of methyl β-apo carotenoates is consistant with this result, which suggests that isomytiloxanthin has the alkyl groups at C-5 and C-6 of the cyclohexanone ring trans.
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Résonance Magnétique Nucléaire de 17O. Aldéhydes et cétones aliphatiques: additivité des effets de substitution et corrélation avec la 13C‐RMN

TL;DR: The 17O-chemical shifts of 9 aldehydes, 22 aliphatic and 4 alicyclic ketones, in the natural abundance FT.-NMR. spectra followed a good correlation with the 13C-chemical shift of the terminal C-atoms of corresponding methylene compounds.
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