1H and 13C NMR investigations of N, N′-bis(2- and 3-pyridinyl)-2,6-pyridine dicarboxamides

Abstract

1H NMR spectra of N, N′-bis(2-pyridinyl)-2,6-pyridinedicarboxamides (1 to 3) and N, N′-bis(3-pyridinyl)-2,6-pyridinedicarboxamide shifts and coupling constants have been obtained from the simulation of the resolution enhanced spectra. 13C NMR spectra were analysed with the help of HETCORR and proton coupled 13C spectra. The 13C 1H coupling constants were obtained by the simulation of the proton coupled 13C NMR spectra. From 1H NMR spectra and NOE enhancements, it is inferred that the two 2-pyridyl rings of 1 to 3 are coplanar with the amide plane, while the 3-pyridyl ring of 4 is out of the amide plane.