The inside cover picture illustrates novel wavelength-dependent transformations of pyrazolo[1,2-a]pyrazolones into 3D-rich heterocyclic systems. The robot with flashlights represents how two distinct products can be easily obtained by simply adjusting the irradiation wavelength, leading to either 1,2-diazepines through ring expansion or tricyclic product via consecutive 4π-electrocyclization. These transformations are highly stereoselective, do not require photocatalysts or additives, and can be easily scaled up. For more details, see the Research Article by I. Kulašić, B. Štefane and co-workers (I. Kulašić, N. Petek, H. Brodnik, U. Grošelj, J. Svete, B. Štefane, Adv. Synth. Catal. 2024, 366, XXXX–XXXX; DOI: 10.1002/adsc.202400684)

中文翻译：

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吡唑唑酮[1,2-a]吡唑啉酮的无光催化剂波长依赖性顺序环转变。


内封面图片说明了吡唑唑并[1,2-a]吡唑啉酮向富含 3D 的杂环系统的新型波长依赖性转化。带手电筒的机器人代表了如何通过简单地调整照射波长轻松获得两种不同的产物，通过扩环产生 1,2-二氮卓类物质或通过连续的 4π-电环化产生三环产物。这些转化是高度立体选择性的，不需要光催化剂或添加剂，并且可以很容易地放大。有关更多详细信息，请参阅 I. Kulašić、B. Štefane 及其同事 （I. Kulašić， N. Petek， H. Brodnik， U. Grošelj， J. Svete， B. Štefane， Adv. Synth.加泰罗尼亚。2024， 366， XXXX–XXXX;DOI： 10.1002/adsc.202400684）