Department of Chemistry, National Cheng Kung University, No. 1 Ta-Hsueh Rd., 70101 Tainan, Taiwan.
Angew Chem Int Ed Engl. 2013 Jul 22;52(30):7791-4. doi: 10.1002/anie.201303875. Epub 2013 Jun 21.
Polygons: [8]Circulenes were easily prepared by Pd-catalyzed annulations of tetraiodotetraphenylenes with alkynes. Their saddle-shaped structure with an [8]radialene character was identified by X-ray crystallography. Similar to 1,3,5,7-cyclooctatetraene, they have a tub-shaped eight-membered ring, but all of the bond lengths and bond angles are almost equal. Variable-temperature NMR investigations showed interesting dynamic behavior.
[8]通过钯催化四碘四苯并炔的环加成反应，很容易制备出轮烯。通过 X 射线晶体学确定了它们具有鞍形结构和[8]轮烯特征。与 1,3,5,7-环辛四烯类似，它们具有管状的八元环，但所有键长和键角几乎相等。变温 NMR 研究显示出有趣的动态行为。
