ChemInform Abstract: CARBON-13 NUCLEAR MAGNETIC RESONANCE SPECTRA OF ORTHO-SUBSTITUTED ACETOPHENONES: ENHANCED SUBSTITUENT EFFECTS ON THE CARBONYL GROUP

1982 ◽  
Vol 13 (45) ◽  
Author(s):  
G. GOETHALS ◽  
R. UZAN ◽  
L. NADJO ◽  
J.-P. DOUCET
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Carbonyl Group ◽  
Substituent Effects ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

Axial dissymmetry induced magnetic nonequivalence in the 13C nuclear magnetic resonance spectra of allenes

1980 ◽  
Vol 58 (9) ◽  
pp. 928-931 ◽  
Author(s):  
Pierre L. Beaulieu ◽  
Veronique M. Morisset ◽  
Dennis G. Garratt
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Substituent Effects ◽  
Methyl Carbon ◽  
Substituent Group ◽  
Nuclear Magnetic Resonance Spectra ◽  
13C Nuclear Magnetic Resonance ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The observation of the magnetic nonequivalence of isopropyl methyl carbon resonances as a result of axial dissymmetry in 27 appropriately substituted allenes is reported. The magnitude of the nonequivalence Δ is more dependent upon the adjacent substituent group than upon the substituents which are bonded to the remote sp2 carbon of the allene. A mechanism based upon the transmission of substituent effects from the remote substituents to the collinear π orbitals is proposed.

The Carbon-13 Nuclear Magnetic Resonance Spectra of 2-Acetamido-2-deoxy-D-hexoses and some Specifically Deuteriated, O-Acetylated, and Phosphorylated Derivatives

1973 ◽  
Vol 51 (22) ◽  
pp. 3812-3819 ◽  
Author(s):  
D. R. Bundle ◽  
H. J. Jennings ◽  
Ian C. P. Smith
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Substituent Effects ◽  
Model Compounds ◽  
Initial Assignment ◽  
Nuclear Magnetic Resonance Spectra ◽  
Polysaccharide Antigens ◽  
Derivatives Of ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The 13C n.m.r. spectra of the 2-acetamido-2-deoxy-D-hexoses and some 3-O-acetyl and 1-phosphate derivatives are assigned and discussed. To facilitate the interpretation of the spectra, an initial assignment of the resonances in the spectrum of 2-acetamido-2-deoxy-D-glucose was required. For this purpose, both the 3-2H and 4-2H derivatives of this acetamido-hexose were synthesized. These syntheses are reported together with those of 2-acetamido-3-O-acetyl-2-deoxy-D-glucose and 2-acetamido-2-deoxy α- and β-D-glucose-1-phosphate. These model compounds were used to study substituent effects related to the 2-acetamido-2-deoxy-D-hexose-containing polysaccharide antigens of N. meningitides.

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