scholarly journals A High-Resolution Solid-State13C NMR Study of (1→3)-β-D-Glucans from Various Sources. Conformational Characterization as Viewed from the Conformation-Dependent13C Chemical Shifts and Its Consequence to Gelation Property

1986 ◽  
Vol 59 (7) ◽  
pp. 2093-2101 ◽  
Author(s):  
Hazime Saitô ◽  
Ryoko Tabeta ◽  
Takuma Sasaki ◽  
Yûko Yoshioka
Keyword(s):  
High Resolution ◽  
Chemical Shifts ◽  
Nmr Study

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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