Radical cation‐induced crossed [2+2] cycloaddition of electron‐deficient anetholes was developed with the use of Fe(OTf)₃ as an initiator. Various 1,2‐diarylcyclobutanes can be synthesized in high yields with high diastereoselectivity from electron‐deficient anetholes, which have been less explored using conventional methods. This practical reaction system can be used for a decagram‐scale reaction (12 gram), in which the resulting product can be transformed to 1,2‐dicarbonyl compounds.

中文翻译：

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铁（III）盐引发的电子缺陷型自由基的自由基阳离子诱导的交叉[2 + 2]环加成反应

利用Fe（OTf）₃作为引发剂，开发了缺电子的茴香脑的自由基阳离子诱导的交叉[2 + 2]环加成反应。可以从缺乏电子的茴香脑中以高收率和高非对映选择性合成各种1,2-二芳基环丁烷，而传统方法很少对此进行探索。该实用的反应系统可用于十克规模的反应（12克），其中所得产物可转化为1,2-二羰基化合物。