Seven Doubly Bridged Ferrocene Units in a Cycle (pages 387–389)
Dipl.-Chem. Birgit Grossmann, Prof. Dr. Jürgen Heinze, Dr. Eberhardt Herdtweck, Prof. Dr. Frank H. Köhler, Prof. Dr. Heinrich Nöth, Dipl.-Chem. Holger Schwenk, Dipl.-Chem. Michael Spiegler, Dipl.-Chem. Wolfgang Wachter and Dr. Bernd Weber
Article first published online: 22 DEC 2003 | DOI: 10.1002/anie.199703871
What looks like a scoop wheel on the right are seven ferrocene units, which are linked by four Me2Si groups to the two nearest neighbors. The cycle, which is formed in a polygemination reaction (that is, the reaction of a transition metal halide with a biscyclopentadienyl dianion to give a polymer), has the rare C7h symmetry (idealized). The compound is stable up to 360°C and can be oxidized in three steps up to a heptacation.