Tetrachloro- and tetrabromo-1,2-benzoquinone have been shown to add efficiently to several cyclopentadienones by a high-temperature melt reaction. The products in all cases were cyclopentadioxinones.
W. M. Horspool, D. T. Anderson and C. Martin, J. Chem. Soc. C, 1971, 398 DOI: 10.1039/J39710000398
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