Reactions of quinones with aromatic ethers. Part IV. Dibenzofurans from the cyclisation of arylbenzoquinones
Abstract
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.