Substituent effects in the 13C nuclear magnetic resonance spectra of aryl ether copolymers: 4. Materials containing sulphonated aryl rings

Polymer ◽  
1990 ◽  
Vol 31 (1) ◽  
pp. 126-129 ◽  
Author(s):  
Raymond J. Abraham ◽  
Ian S. Haworth ◽  
Alan Bunn ◽  
R.Angus Hearmon
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Substituent Effects ◽  
Aryl Ether ◽  
Nuclear Magnetic Resonance Spectra ◽  
13C Nuclear Magnetic Resonance ◽  
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.

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