Oxidation of alkoxyphenols. Part 28. On the configuration of 2,2′-diphenoquinones
Abstract
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.