The n.m.r. spectra of a number of 2,2′-diphenoquinones imply that they have the trans-configuration. The importance of charge-separated structures in unsymmetrical quinones is discussed in relation to the formation of oxepino[2,3-b]benzofurans.
F. R. Hewgill, B. La Greca, F. Legge and P. E. Roga, J. Chem. Soc., Perkin Trans. 1, 1983, 131 DOI: 10.1039/P19830000131
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