A Study of Hydrogen Bonding and Rotational Isomerism in Amides by Nuclear Magnetic Resonance Spectroscopy PDF Download
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Author: Laurine Anna LaPlanche
Publisher:
ISBN:
Category : Amides
Languages : en
Pages : 318
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Book Description
Author: Laurine Anna LaPlanche
Publisher:
ISBN:
Category : Amides
Languages : en
Pages : 318
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Author: Lester Reinhardt Isbrandt
Publisher:
ISBN:
Category : Amides
Languages : en
Pages : 292
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Author: William Chung-Tsing Tung
Publisher:
ISBN:
Category : Amides
Languages : en
Pages : 468
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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: Michinori Oki
Publisher: Springer Science & Business Media
ISBN: 3642510248
Category : Science
Languages : en
Pages : 261
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Rotation about the Carbon-Carbon single bond is generally regarded to be unrestricted. About 50 years ago, rotational isomers were found to exhibit optical activity: substituted biphenyl derivatives. However, the author has investigated other classes of compounds that have stable rotational isomers at room temperature. These compounds can serve as models for studying very weak intermolecular interactions, that are difficult to observe. Even diastereotopic groups show different chemical reactivity. From the contents: The "Free Rotation Concept" - Rotamer Populations - Barriers to Rotation - Reactivity of Rotational Isomers.
Author: Arthur Greenberg
Publisher: John Wiley & Sons
ISBN: 9780471420255
Category : Science
Languages : en
Pages : 672
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An authoritative reference to an important and ubiquitous chemical linkage The amide linkage is one of the most fundamental and widespread chemical bonds in nature, underlying the properties of a vast array of organic molecules, polymers, and materials, including peptides and proteins. Arthur Greenberg, Curt Breneman, and Joel Liebman's peerless text provides comprehensive coverage of the experimental, structural, and computational findings that shed light on the chemical and physical properties of the amide linkage, as well as its emerging applications in materials and biotechnology. Chapters in The Amide Linkage highlight how this chemical bond factors in the design of enzyme inhibitors, cyclic peptides, antibacterial agents, and emerging nanotechnology applications. This one-of-a-kind study also: * Discusses selected aspects of chemical reactions, structure, bonding, and energetics of the amide bond, including amide rotational barriers, stereochemistry, complexation, spectroscopy, and thermochemistry * Presents specific applications to supramolecular and stereospecific synthesis * Discusses key aspects of peptide and protein chemistry-such as molecular recognition, conformation, and folding-in terms of the amide linkage * Includes chapters contributed by numerous eminent chemists and biochemists Organic, medicinal, polymer, and physical chemists, as well as biochemists and materials scientists, will find The Amide Linkage to be an invaluable addition to their professional libraries.
Author: James Calvin Woodbrey
Publisher:
ISBN:
Category : Amides
Languages : en
Pages : 420
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Author: Charles Peter Lollo
Publisher:
ISBN:
Category :
Languages : en
Pages : 298
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Author: Wesley Earl Bentz
Publisher:
ISBN:
Category :
Languages : en
Pages : 634
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Author: John Ryland Holmes
Publisher:
ISBN:
Category : Hydrogen bonding
Languages : en
Pages : 424
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