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■ Positional Effect on the NMR Spectroscopy of Esters and Amides of 2- and 3-Furancarboxylic Acids

Kyu Ok Jeon, Ji Sook Yu, and Chang Kiu Lee*

*Department of Chemistry, Kangwon National University, 192-1 Hyoja-2-dong, Chuncheon, Kangwon 200-701, Korea

Abstract

Eleven derivatives of esters and amides of 2- and 3-furancarboxylic acids and their NMR spectra were obtained in DMSO-d₆. The spectra of esters were also obtained in chloroform-d. The chemical shift values show good correlation with the Hammett substituent parameters. The slopes, however, show contrasting phenomena depending on the position in the furan ring.