Treatment of suitably diaminated 1,4-benzoquinones (I) or monoaminated 2-hydroxy-1,4-benzoquinones (II) with sulphuric acid gives the title compounds. These exist predominantly in the o-hydroxy-p-quinone imine form rather than the p-amino-o-quinone form in chloroform solution, whereas in ethanol the tautomers are present in approximately equal amounts.
I. Baxter and R. B. Titman, J. Chem. Soc. C, 1970, 2078 DOI: 10.1039/J39700002078
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