2,5- and 2,6-Dichlorobenzoquinone react with diazotised 3-methoxy-4-methyl- and 4-methoxy-3-methyl-aniline to form the expected monoaryl- and diaryl-dichlorobenzoquinones which undergo cyclisation on treatment with aluminium chloride to give the corresponding dichlorodibenzofurans.
O. C. Musgrave and C. J. Webster, J. Chem. Soc., Perkin Trans. 1, 1974, 2263 DOI: 10.1039/P19740002263
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