Ruthenocene mit sterisch anspruchsvollen Cyclopentadienylliganden

1-tert-Butyl-2,4-cyclopentadiene (1), 1,3-di(tert-butyl)-2,4-cyclopentadiene (2), 1-ethyl-2,3,4,5- tetramethyl-2,4-cyclopentadiene (3), 1-iso-propyl-2,3,4,5-tetramethyl-2,4-cyclopentadiene (4), 1- tert-butyl-2,3,4,5-tetramethyl-2,4-cyclopentadiene (5), and 1-phenyl-2,3,4,5-tetramethyl-2,4-cyclopentadiene (6) react with n-butyl lithium followed by tributyltin chloride to give the corresponding tributyl(cyclopentadienyl)stannanes Bu SnCp 1a to 6a. The reactions of 1a to 6a with Ru(COD)Cl result in the formation of the corresponding ruthenocenes RuCp 1b to 6b. Ru(C Ph (7b) is prepared from [Ru(p-cymol)Cl and Na[C Ph ]. The H and C NMR spectra of the new stannanes 1a to 6a and the ruthenocenes 1b to 7b as well as the single crystal X-ray structure of 4b are reported and discussed.