1 H-cyclopropa(b)naphthalene-3,6-dione

Cerium ammonium nitrate demethylation and oxidation of 3,6-dimethoxy-1H-cyclopropa[b]-naphthalene 6 provides 1H-cyclopropa[b]naphthalene-3,6-dione 8 as the first stable cyclopropaquinone.