The Friedel–Crafts condensation of thieno[3,2-b][1]benzothiophen with some mono- and di-methyl homologues of benzoyl chloride, and of thieno[3,2-b][1]benzcthiophen-2-carbonyl chloride with m- and p-xylene, afforded a series of ketones which underwent Elbs pyrolysis to furnish naphtho[2′,3′:4,5]thieno[3,2-b][1]benzothiophen and three of its methyl homologues.
P. Jacquignon, A. Croisy, A. Ricci and D. Balucani, J. Chem. Soc., Perkin Trans. 1, 1973, 734 DOI: 10.1039/P19730000734
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