A macrocyclic dibenzocoronenetetracarboxdiimide containing two benzo‐21‐crown‐7 groups has been synthesized. It shows liquid‐crystalline behavior and selectively binds Pb2+ or K+ to form 1:2 complexes in solution. The complexation leads to a significant increase of fluorescence; the surface organization of discotic columnar structures, in the solid‐state, can be controlled by selective ion binding
Divergent and Stereoselective Synthesis of Tetraarylethylenes from Vinylboronates
作者:Minghao Zhang、Yisen Yao、Peter J. Stang、Wanxiang Zhao
DOI:10.1002/anie.202008113
日期:2020.11.2
elucidated. TAEs have widespread applications in material science and supramolecular chemistry due to their aggregation‐inducedemission (AIE) properties. The divergent and stereoselective synthesis of [3+1]‐, [2+2]‐, and [2+1+1]‐TAEs via multiple couplings of vinylboronates with aryl bromides is demonstrated. These couplings feature a broad substrate scope and excellent functional group compatibility
palladium and rhodium catalysis. The catalytic activities correlated well with the extractabilities of the phosphine ligands. The compound [RhCl(cod)]2, combined with IIIc and IIId, shows high activities toward catalytic hydrogenation of potassium and caesium cinnamates, respectively. Replacement of allyl bromide with powdered sodium or potassium iodide in benzene to give allyl iodide are catalyzed by