scholarly journals Transmission of Substituent Effects through Oxygen and Sulfur Atoms. II.13C Chemical Shifts of Ring-Substituted Phenyl Vinyl Ethers and Sulfides

1973 ◽  
Vol 46 (5) ◽  
pp. 1422-1425 ◽  
Author(s):  
Okitsugu Kajimoto ◽  
Masaru Kobayashi ◽  
Takayuki Fueno
Keyword(s):  
Chemical Shifts ◽  
Substituent Effects ◽  
Vinyl Ethers ◽  
13C Chemical Shifts ◽  
Phenyl Vinyl

Substituent effects on 13C chemical shifts

1972 ◽  
Vol 7 (4) ◽  
pp. 364-369 ◽  
Author(s):  
William B Smith ◽  
Dennis L Deavenport
Keyword(s):  
Chemical Shifts ◽  
Substituent Effects ◽  
13C Chemical Shifts

Carbon-13 chemical shifts of some pyridines, 2,2'-bipyridyls and 1,10-phenanthrolines

1978 ◽  
Vol 31 (6) ◽  
pp. 1255 ◽  
Author(s):  
A Marker ◽  
AJ Canty ◽  
RTC Brownlee
Keyword(s):  
Solvent Effects ◽  
Chemical Shifts ◽  
Substituent Effects ◽  
Empirical Correlations ◽  
Electron Densities ◽  
Total Electron ◽  
13C Chemical Shifts ◽  
Methyl Derivatives

13C chemical shifts of pyridine, 2,2'-bipyridyl and 1,10-phenanthroline, and some of their methyl derivatives have been determined. All measurements were made on 0.25 M solutions in CDCl3, thus enabling comparisons of chemical shifts and substituent effects to be made without complications from solvent effects. For the three classes of compounds, common correlations exist between 13C chemical shifts and both CNDO/2 and INDO calculated carbon total electron densities, with the results suggesting that CNDO/2 calculations provide more suitable data for empirical correlations with 13C chemical shifts.

A reinterpretation of beta, gamma, and delta substituent effects on 13C chemical shifts

1976 ◽  
Vol 54 (19) ◽  
pp. 2985-2995 ◽  
Author(s):  
Helmut Beierbeck ◽  
John K. Saunders
Keyword(s):  
Chemical Shifts ◽  
Substituent Effects ◽  
13C Chemical Shifts

It is shown that β-, γ-, and δ-substituent effects on 13C chemical shifts may be better understood by assuming that the upfield shifts caused by gauche γ-substituents are not due to non-bonded interactions introduced with the γ-group, but that they are due to the removal of the hydrogen on the β-substituent.

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