Substituent effects on the carbon-13 N.M.R. chemical shifts of side-chain carbons in aromatic systems

1 January 1977

journal article
Published by CSIRO Publishing in Australian Journal of Chemistry

Vol. 30 (2) , 351-355
https://doi.org/10.1071/ch9770351

Abstract

Carbon-13 chemical shifts have been measured for the side-chain carbon atoms of a number of meta- and para-disubstituted benzenes. The side chains examined were CN, CF3, Ac, CO2Et, Me, OMe and NMe2. The substituent-induced 13C shifts of these side chains were related to Hammett substituent effects by the Dual Substituent Parameter method and showed a widely varying dependence upon the blend of inductive and resonance effects. The transmission of substituent effects through aromatic systems and the factors that influence 13C shifts are discussed.

Keywords

CHAIN CARBONS
SUBSTITUENT EFFECTS
AROMATIC SYSTEMS
N.M.R
CHEMICAL SHIFTS

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