Chapter 17 High-Resolution NMR Methods for Study of Higher Plants

1995 ◽  
pp. 245-258 ◽  
Author(s):  
Justin K.M. Roberts ◽  
Jian-Hua Xia
Keyword(s):  
High Resolution ◽  
Higher Plants ◽  
High Resolution Nmr ◽  
Nmr Methods

A Comparison of Strategies for Obtaining High-Resolution NMR Spectra of Quadrupolar Nuclei

1996 ◽  
Vol 51 (5-6) ◽  
pp. 321-329 ◽  
Author(s):  
R. E. Youngman ◽  
U. Werner-Zwanziger ◽  
J. W. Zwanziger
Keyword(s):  
High Resolution ◽  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Quadrupolar Nuclei ◽  
Multiple Quantum ◽  
Oxide Glasses ◽  
High Resolution Nmr ◽  
Angle Spinning ◽  
Nmr Methods

Abstract A comparison of high-resolution NMR methods for quadrupolar nuclei is presented. The samples studied are pure and modified boron oxide glasses, and the boron NMR spectra are recorded using three different experiments capable of high resolution: Double Rotation, Dynamic Angle Spinning, and Multiple-Quantum Magic Angle Spinning. Resolution of the similar ring and nonring boron sites in these glasses, in the presence of disorder, provides a realistic study of the strengths and limitations of these experiments. Conclusions about the relative applicability of these experiments in different situations are presented.

Liquid- and solid-state high-resolution NMR methods for the investigation of aging processes of silicone breast implants

Biomaterials ◽  
2003 ◽  
Vol 24 (1) ◽  
pp. 35-46 ◽  
Author(s):  
Anja Britta Birkefeld ◽  
Rüdiger Bertermann ◽  
Hellmut Eckert ◽  
Bettina Pfleiderer
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Breast Implants ◽  
Silicone Breast Implants ◽  
High Resolution Nmr ◽  
Nmr Methods

Increasing the sensitivity of 2D high-resolution NMR methods applied to quadrupolar nuclei

2005 ◽  
Vol 172 (2) ◽  
pp. 268-278 ◽  
Author(s):  
J.P. Amoureux ◽  
L. Delevoye ◽  
S. Steuernagel ◽  
Z. Gan ◽  
S. Ganapathy ◽  
...  
Keyword(s):  
High Resolution ◽  
Quadrupolar Nuclei ◽  
High Resolution Nmr ◽  
Nmr Methods

Constitution and Properties of the 8,8'-μ-(H2NO)=(1,2-C2B9H10)2-3-Co Bridged Cobaltaborane

1994 ◽  
Vol 59 (6) ◽  
pp. 1326-1336 ◽  
Author(s):  
Jaromír Plešek ◽  
Farzaneh Hosseinpour Rajabi ◽  
Veena Vangani ◽  
Jiří Fusek
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Reductive Cleavage ◽  
High Resolution Nmr ◽  
Nmr Methods ◽  
Derivatives Of

Constitution of 8,8'-μ-H2N(-O-)(1,2-C2B9H10)2-3-Co sandwich has been elucidated 17 years after its first synthesis, via high resolution NMR methods supplemented by mass spectrometry. The species gives relevant "oximes" with acetone and benzaldehyde and is quantitatively methylated to the N,N'-dimethyl derivative, which shows an interesting redox disproportionation to a triatomically bridged sandwich with a 8,8'-μ-O-CH=N(Me)- bridge between both ligands. Several other "peculiar" reactions of this dimethyl derivative are discussed. On reductive cleavage of the parent hydroxylamine the non-bridged 8-HO-8-H3N(1,2-C3B3H10)2-3-Co zwitterion is obtained. Mono-, di- and trimethylated derivatives of this non-bridged species are characterized.

The High Resolution NMR Spectra of Pesticides. II. The DDT-Type Compounds

1969 ◽  
Vol 52 (5) ◽  
pp. 1074-1092 ◽  
Author(s):  
L H Keith ◽  
A L Alford ◽  
A W Garrison
Keyword(s):  
Nuclear Magnetic Resonance ◽  
High Resolution ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Aromatic Rings ◽  
Nuclear Magnetic Resonance Spectra ◽  
High Resolution Nmr ◽  
Related Compounds ◽  
Deshielding Effect

Abstract The high resolution nuclear magnetic resonance spectra of the DDT class of pesticides and related compounds are discussed, including a study of the resonances of the aromatic protons as they are affected by various substiluents. The CCl3 moiety on the α-carbon strongly deshields the ortho protons on the aromatic rings, and this deshielding effect is greatly enhanced by substitution of a chlorine ortho rather than para on the aromatic ring. These deshielding effects are explained by a consideration of the electronegativity of the substituents and the stereochemistry of the molecule. The chemical shifts and coupling constants are tabulated.

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