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Paramagnetic products formed in the reactions of organometallic compounds. XII ESR study of oxido anion substituted diaryl ketyl radicals by Ľ. Malik; A. Staško; E. Mat'ašová; A. Tkáč is a Chemistry article available to read on EtoBox.

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## Abstract 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 __a__~2~^H^ = 0.43 mT, __a__~6~^H^ = 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.

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Author

Ľ. Malik; A. Staško; E. Mat'ašová; A. Tkáč

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; John Wiley and Sons Ltd; Wiley (ISSN 0749-1581)

Published

1981

Language

EN

Field

Chemistry (Physical Sciences)