Abstract
New 4,4,8,8-tetraalkyltetrahydro-4,8-disila- s-indacene ligands were synthesized in order to increase the solubility of higher-nuclear bridged metallocenes. CpNa and R 2SiCl 2 (R=Et, n-Bu) gave the silylated cyclopentadienes (C 5H 5)SiR 2Cl that were converted to disila- s-indacenes carrying R at the silyl bridges. Deprotonation led to the corresponding dianions, which after addition of CpNa, reacted with solvated iron dichloride to yield dinuclear ferrocenes that were bridged by R 2Si groups. In any case, mixtures of syn- and anti-isomers were obtained from which the pure anti-isomers could be separated by crystallization. All compounds were characterized by 1H- and 13C-NMR spectroscopies and partly by mass spectroscopy. In cyclic voltammetry, the anti-isomers of the dinuclear ferrocenes underwent successive electron transfers with separations that were determined by solvation effects.
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