3-(4-Methoxy-2-methylbenzoyl)- and 3-(4-methoxy-2,5-dimethylbenzoyl)-benzo[b]thiophen underwent the Elbs reaction with rearrangment to give derivatives of benzo[b]naphtho[2,1-d]thiophen, whereas 2-(4-methoxy-2,5-dimethylbenzoyl)benzo[b]thiophen gave the normal cyclisation product, i.e. a benzo[b]naphtho[2,3-d]thiophen.
Cl. Marie, N. P. Buu-Hoï and P. Jacquignon, J. Chem. Soc. C, 1971, 431 DOI: 10.1039/J39710000431
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