抄録
The benzene-soluble fraction of brown coal depolymerized in phenol with p-toluene sulphonic acid as catalyst was methylated and fractionated by liquid chromatography. 2-(4-methoxyphenyl)-benzofuran, 9-(4-methoxyphenyl)-xanthene, 9-(2-methoxyphenyl)-xanthene and xanthone were identified, suggesting that the structures
-CH2-O=CH-, -CH=C-OH-, etc.
may exist in the brown coal.
