Cyclohex-1-en-4-yn-3,6-dione (benzynequinone)(III) is generated by oxidation of 1-aminobenzotriazole-4,7-dione (II) with lead tetra-acetate, and isolated as 5,6,7,8-tetraphenyl-1,4-naphthaquinone (IV)(40%) from a reaction with tetracyclone.
C. W. Rees and D. E. West, J. Chem. Soc. D, 1969, 647 DOI: 10.1039/C29690000647
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