The inside back cover picture shows the controllable skeleton rearrangement of 3‐substituted cyclobutanones under basic conditions. In this paper, a series of 3‐substituted cyclobutanones with different Z group underwent skeleton rearrangement with the treatment of K₃PO₄ and 18‐crown‐6 ether. Various lactones, lactams and acids were afforded in this concise reaction. More interestingly, an eight‐membered ring was produced with pentaflurophenyl group as a good leaving group. More details are discussed in the article by Lu et al. on page 1103—1106.

中文翻译：

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内封底

封底的内部图片显示了在基本条件下3取代的环丁酮的可控骨架重排。本文用K ₃ PO ₄和18-crown-6醚处理了一系列带有不同Z基团的3-取代的环丁酮，进行了骨架重排。在该简洁的反应中提供了各种内酯，内酰胺和酸。更有趣的是，产生了一个带有五氟苯基作为良好离去基团的八元环。Lu等人的文章中讨论了更多细节。在第1103-1106页。