ISSN:
0030-4921
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
In the reactions of alkyl-substituted-benzenecarboxylic and -2-hydroxybenzenecarboxylic acids (ArCOOH) with alkyl-substituted phenyl Grignard reagents (RMgX) in the presence of nickel, ketyl radicals Ar—CO-—R are formed. The para substituents (H, Me, Et, Isopr and t-Bu) of R increase the non-equivalence of its ortho protons (a change of a2H = 0.43 mT, a6H = 0.422 mT to 0.435 mT, 0.395mT respectively, on substituting t-butyl for H at position 4). The oxido anion group originating from 2-hydroxybenzenecarboxylic acid has a strong push effect and nearly doubles the unpaired spin density on the phenyl ring R.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1270150117
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