Known preparations of naphthazarin, and 2-methylnaphthazarin have been found to give by-products, which have been identified. 5,8-Dihydroxy-1,3-dimethylnaphtho[2,3-c]furan-4,9-quinone has been synthesised, and its chemistry is described; 2-bromomethylnaphthazarin diacetate has also been obtained. Nuclear magnetic resonance measurements are reported for the naphthoquinones, their precursors, and derivatives.
L. A. Cort and P. A. B. Rodriguez, J. Chem. Soc. C, 1967, 949 DOI: 10.1039/J39670000949
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