Aromatic constitutents in Wandoan coal-derived distillate were analyzed by means of capillary gas chromatography/mass spectrometry (GC/MS) in order to clarify their aromatic skeletal structures. The major aromatic skeletons could be classified into several groups, the molecular weights of which were represented by 78+50n, 118+50n, 154+50n, 166+50n, 202+50n, 242+50n (n=0,1,2,···), and so on. The increase by 50 corresponded to an additional benzene ring fused to the original skeleton. Some new types of aromatic skeletons, such as dihydrophenalene and benzindan, were found to be present in significant amounts.
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Sugimoto et al. (1990) studied this question.
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