The synthesis of benzonaphthothiophenes 9 and 10 and of benzophenanthrothiophenes 14–17 through Elbs cyclodehydration of ortho ‐methylated aroylbenzo[ b ]thiophenes is described. The occurrence of a rearrangement of the thiophene ring in the course of the cyclization is discussed as well as the influence of the temperature on a concurrent cyclodehydration process. Several of these poly‐condensed thiophenes were found carcinogenic in mice.
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Croisy et al. (1984) studied this question.
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