Nuclear Magnetic Resonance Studies of Syn-anti Isomers PDF Download
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Author: Robert Arthur Taller
Publisher:
ISBN:
Category : Isomerism
Languages : en
Pages : 150
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Author: Robert Arthur Taller
Publisher:
ISBN:
Category : Isomerism
Languages : en
Pages : 150
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Author: Carol Elizabeth Osborne
Publisher:
ISBN:
Category : Hydrazines
Languages : en
Pages : 94
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Author: Thomas H. Crawford
Publisher:
ISBN:
Category : Nuclear magnetic resonance
Languages : en
Pages : 238
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The research problem presented herein involved the structural determination of several a,~-unsaturated acids and esters. The solution to this problem was sought in the nuclear magnetic resonance (n.m.r.) spectra of these compounds. The n.m.r. approach to structural problems in organic chemistry has been investigated extensively in the past ten years and it has proven to be an extremely powerful tool for this type of analysis. The data used in the structural determinations are presented in tabulated fo~, and in. the appendix tracings of the original spectra may be found. Each compound is discussed separately with respect to its probable structure and its recorded spectrum. Two brief sections follow the discussion of the spectra. One of these concerns a stereospecific solvent effect and the other relates to the effect of an anisotropic neighboring double bond on proton r -values. The configurational aSSignments for the various compounds were made possible by observing the changes in chemical shift for particular protons in different isomers and by comparison of the observed spin coupling constants with those reported in the literature. Allmost all of the compounds discussed in this thesis were of such a nature that their spectra could be interpreted on a simple first order basis. In the limited number of cases which involved more complex spectra, some approximations were attempted which made possible the assignment of configuration at several bonds. In some cases the assignments were not conclusive, but they found strong support in the approximate treatments given the complex splitting patterns.
Author: Daniel S. Dyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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The temperature and solvent dependence of the nuclear magnetic resonance (nmr) spectra of a number of amides has been studied. Hindered internal rotation about the C(O)-N and aryl-nitrogen bonds was detected in a series of N-acylhydrazobenzenes. In this series of compounds, hindered rotation about the C(O)-N bond afforded, in most cases, a mixture of cis-trans isomers in solution. These isomers were easily detected by nmr spectroscopy. Thus the free energies of activation, at the coalescence temperatures, for the hindered rotations were calculated. Similar temperature dependence studies on the nmr spectra of N-phenylacetamide and N-(o-tolyl) acetamide also afforded evidence for hindered internal rotation about the C(O)-N bond. However for these compounds, one isomer predominated to such a degree in solution that the presence of the second isomer was barely detected by nmr spectroscopy. A temperature dependence study of the fluorine-19 resonance spectra of both 1 and 2 deg rotation about the C(O)-N bond. However for the first time, coupling between the trifluoromethyl group and a nitrogen proton was observed. Also the proton nmr spectrum of 1,1,1-trifluoroacetamide, itself, in a dry acetone solution at low temperatures afforded the direct observation of two separate signals for the two nitrogen protons. (Author).
Author: Christopher Hall
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Royal Institute of Chemistry
Publisher: Academic Press
ISBN:
Category : Science
Languages : en
Pages : 316
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'Lectures at a summer school organized by the Royal Institute of Chemistry in 1964.'
Author: Sture Forsen
Publisher:
ISBN:
Category :
Languages : sw
Pages :
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Author: S. Forsén
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Fusako Yamauchi
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Author: Nelson Chin-Tse Hsi
Publisher:
ISBN:
Category : Aldehydes
Languages : en
Pages : 186
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