The Cover Feature shows that [2+2]‐Cycloadditions of cinnamates are efficiently carried out both in solution and in gel media using Ir‐based photocatalyst under visible light irradiation. The reaction media governs the stabilization of the biradical key intermediate, thus slowing down the ring closure step and facilitating the equilibration towards the sterically most favorable all‐trans cyclobutanes. The use of gelled solvents allows performing the reaction under aerobic conditions. More information can be found in the Full Paper by Alex Abramov et al.

中文翻译：

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反应介质对肉桂光敏性[2 + 2]-环加成反应的影响

封面功能表明，在可见光照射下，使用Ir基光催化剂在溶液和凝胶介质中均可有效地进行[2 + 2]-肉桂酸酯的环加成反应。反应介质控制着双自由基键中间体的稳定性，从而减慢了闭环步骤并促进了对空间最有利的全反式 环丁烷的平衡。凝胶溶剂的使用允许在有氧条件下进行反应。可以在Alex Abramov等人的论文全文中找到更多信息。