Anhydrous aluminium chloride removes thiophen from boiling benzene as tetrahydrothiophen, tetrahydro-3-phenylthiophen, and hydrogenated derivatives of tetrahydro-3-naphthylthiophen. A minute proportion (ca. 0·04%) of the benzene is converted, inter alia, into biphenyl, p-terphenyl, homologous alkylbenzenes, naphthalene and its hydrogenation products, and involatile pitch.
D. H. Johnson, J. Chem. Soc. C, 1967, 2275 DOI: 10.1039/J39670002275
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