Syntheses and UV spectra of salicyladehyde derivatives

Abstract

Nine 5-(β-substituted stylryl) salicyladehyde derivatives were prepared by PTC Witting reactions in the paper. The stereochemistry of the Witting reactions and the substituted effect on the UV spectra of salicyladehyde derivaties have been reported. It was observed that the spectra undergo a red shift as the conjugative effect of substituted becomes stronger. A good linear relationship between the shift of UV of p-substituted compounds and conjugation effect was obtained. It showed that the Hammett equation may be applied to the UV frequencies of the title compounds.

Keywords

substituted strlrylsalicyladehyde derivatives / substituted effect / Witting reaction / UV spectra