The direct introduction of a methoxy substituent into the 4-position of 9-phenylsulphonyl-1,2,3,4-tetrahydro-1-oxo-carbazole provides a short synthetic route to 1,4-dihydrocarbazole-1,4-dione.
D. W. M. Benzies and R. A. Jones, J. Chem. Soc., Chem. Commun., 1986, 1019 DOI: 10.1039/C39860001019
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