ISSN:
0030-4921
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
13C substituent shifts in para-substituted phenyl and 2-phenylethenyl carbenium ions have been studied within the general model of para-disubstituted benzenes X—C6H4—Y. Large variations are observed for the ipso shifts induced by the Y substituents (Y = NO2. … OCH3) depending upon the electron demand at the remote carbenium centre. A good representation of these substituent-substituent interactions is obtained by a treatment derived from ‘proportionality relationships’, where the deviations from strict additivity are factorized into two terms characterizing, respectively, the influence of the fixed X group on the ring and the susceptibility of the incoming Y substituent. Continuity of the ipso shift variations in an extended range is demonstrated, without break-off between neutral polarized systems or ions as the electronic influence of the fixed X group increases.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1270111111
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