Aryl radicals (1a,b) afford dihalogenodibenzothiophens (4a,b) as a result of intramolecular homolytic aromatic ipso substitution; the yields increase with temperature and are greater when the displaced halogen is bromine rather than chlorine.
L. Benati, P. C. Montevecchi and A. Tundo, J. Chem. Soc., Chem. Commun., 1978, 530 DOI: 10.1039/C39780000530
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