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Two hydrocarbons previously isolated from a Kuwait mineral oil have been identified as 1,3,6,8- and 1,4,5,8-tetramethylanthracene. 1,3,6,7- and 2,3,6,7-Tetramethylanthracene have been isolated from a high-boiling fraction of an Oklahoma oil. Syntheses of 1,3,6- and 1,3,7-trimethyl-, and of 1,3,5,7-, 1,3,6,8-, and 1,4,5,8-tetramethyl-anthracene are described. The 1,3,6-trimethyl- and 1,3,6,8- and 1,4,5,8-tetramethyl compounds are incorrectly described in the literature.The chemical shift of the methyl protons of a methyl-substituted anthracene depends on the position of attachment of the group to the nucleus and may provide a useful aid in the identification of an unknown polymethyl-anthracene.

1-Methylchrysene and 1,2- and 1,7-dimethylchrysene have been isolated from a high-boiling fraction of a Kuwait mineral oil and identified by comparison with authentic specimens. The synthesis of 1,7-dimethylchrysene is described. From a crystalline mixture of methyl homologues of 11-thiabenzo[a]fluorene obtained from the oil, the 4-methyl isomer was isolated, and the presence of the 1- and 10-methyl derivatives was shown by gas chromatography.

A hydrocarbon isolated from a fraction of a Kuwait mineral oil has been identified by synthesis as 1,2,7,8-tetramethylfluorene. A crystalline mixture of methylbenzo[a]fluorenes from an Oklahoma oil is shown by gas chromatography to contain at least six components, four of which have retention times coincident with those of the 1-, 3-, 4-, and 10-methyl isomers. Syntheses of 1-, 3-, and 4-methylbenzo[a]fluorene are described.