The structures of pyrazine and pyrimidine as determined from natural-abundance 15N and 13C satellites in proton spectra of the oriented molecules

Abstract

The proton spectra with 13C and 15N satellites at natural abundance of the molecules pyrazine and pyrimidine in isotropic and in oriented solvents have been analyzed and indirect couplings between protons as well as between 1H and 15N have been determined. The entire r α structures of the two molecules were derived from the corresponding direct couplings. For some spectra the AISEFT method was used for obtaining the pure satellite information.