Benzo[b]thiophen is formylated in position 3 by dichloromethyl butyl ether in the presence of titanium tetrachloride, whereas 3-methylbenzo[b]thiophen reacts at position 2; benzo[b]naphtho[2,1-d]thiophen gives the 5-formyl derivative in the same reaction.
N. P. Buu-Hoï, A. Croisy and P. Jacquignon, J. Chem. Soc. C, 1969, 339 DOI: 10.1039/J39690000339
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