Preferential Formation of Cyclic Trimers by Palladium-Catalyzed Oxidative Coupling Reactions of 2,18-Diethynylporphyrins
作者:Sumito Tokuji、Hideki Yorimitsu、Atsuhiro Osuka
DOI:10.1002/anie.201207763
日期:2012.12.3
And palladium makes three: In contrast to the formation of cyclic dimers in the Cu‐mediated reaction, Pd‐catalyzed oxidative coupling of 2,18‐diethynylporphyrins preferentially produced cyclic trimers (see scheme). A porphyrin hexamer with a doubly 1,3‐butadiyne‐bridged conjugated trimeric core and directly meso‐appended peripheral porphyrin substituents was also synthesized.