Ruthenocene mit sterisch anspruchsvollen Cyclopentadienylliganden

Abstract

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 Bu3SnCp# 1a to 6a. The reactions of 1a to 6a with Ru(COD)Cl2 result in the formation of the corresponding ruthenocenes RuCp2 # 1b to 6b. Ru(C5H3Ph2)2 (7b) is prepared from [Ru(p-cymol)Cl2]2 and Na[C5H3Ph2]. The 1H and 13C 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.