Ionization Shifts in 1H??NMR Spectra of α, β??Unsaturated Carboxylic Acids

JW Jaroszewski, P Grossen, P Mohr…

Index: Jaroszewski, Jerzy W.; Grossen, Peter; Mohr, Peter; Tamm, Christoph Helvetica Chimica Acta, 1986 , vol. 69, p. 718 - 725

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Citation Number: 7

Abstract

Abstract Changes in chemical shifts of olefinic protons in a number of α, β-and α, β, γ, δ- unsaturated carboxylic acids caused by ionization of the COOH group were investigated. The ionization shifts of α-H-atoms are− 0.09 to 0.07 ppm, those of β-H-atoms are 0.32− 0.47 ppm. The ionization shifts of δ-H-atoms are substantially larger than those of γ-H-atoms. The ionization shifts can be used for immediate determination of the esterification site in ...

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