Petroleum ether soluble part (fraction γ1) and petroleum ether insolu-ble, chloroform soluble part (fraction γ2 ) of pyridine extract of Nakayama lignite were analyzed by 13C-and 1H-NMR spectra.The average molecular structure parameters of the fractions γ1 and γ2 were calculated from the results of quantitative 13C-NMR spectra obtained by the gated decoupling with the relaxation reagent, 1H-NMR spectra, elementary analysis and average molecular weight.
The average molecular structure of aromatic rings in the fraction γ1 consists of ben-zene ring and quinone ring, and that of the fraction γ2 consists of one benzene ring and aromatic rings such as naphthalene.The nonbridge aromatic ring carbons of 50-60 percent in the frac-tions γ1 and γ2 are substituted by alkyl groups.