![Cover Picture: Photoluminescence of Mn2+ in the Borosulfate Zn[B2(SO4)4]:Mn2+ ‐ A Tool to Detect Weak Coordination Behavior of Ligands](https://onlinelibrary.wiley.com/cms/asset/78423b17-841a-4de0-8bd8-6c30e3711028/anie202313698-toc-0001-m.png)
Mn2+ is a so-far still rather underestimated visible emitter that is more abundant than the currently dominantly used emitter Eu2+. This could be a possible alternative for future LED phosphors. The cover picture shows octah...
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Photocatalytic Terminal C−C Coupling Reaction Inside Water Soluble Nanocages
Von Wiley-VCH zur Verfügung gestellt
A method for light-activated Glaser coupling in water is reported that uses visible light to trigger host-guest photoredox chemistry. Cage-confined neutral radicals drive the C−C coupling step through substrate preorganization.
Abstract
Developing methods that activate C−H bonds directly with high selectivity for C−C bond formation in complex organic synthesis has been a major chemistry challenge. Recently it has been shown that photoactivation of weakly polarized C−H bonds can be carried out inside a cationic water-soluble nanocage with visible light-mediated host-guest charge transfer (CT) chemistry. Using this novel photoredox activation paradigm, here we demonstrate C−C bond formation to photo-generate 1,3-diynes at room temperature in water from terminal aromatic alkynes for the first time. The formation of cavity-confined alkyne radical cation and the proton-removed neutral radical species highlight the unique C−C coupling step driven by supramolecular preorganization.
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