4,5-Dihydroxybenzocyclobutene-1,2-dione has been prepared by demethylation of its dimethyl ether which was made by vapour-phase pyrolysis of the anthracene adduct of 6,7-dimethoxyphthalazine-1,4-dione; other benzocyclobutene-1,2-diones have been made in 71–98% yield by this pyrolysis method.
J. F. W. McOmie and D. H. Perry, J. Chem. Soc., Chem. Commun., 1973, 248 DOI: 10.1039/C39730000248
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