Cross-conjugated dienones of type 5 (X = I), which are readily available from phenols, undergo radical cyclization (5 â 6 â 7), and the products are easily aromatized (7 â 8), giving substances that are formally derived by radical cyclization onto a benzene ring (cf.eqn. (1)).
5 型交叉共轭二烯酮(X = I)很容易从
苯酚中获得,它们会发生自由基环化反应(5-6-7),产物很容易芳香化(7-8),从而得到通过自由基环化作用到苯环上而正式衍生的物质(参见式 (1))。