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1-Butyl-2,3,4,5-tetraphenyl-2,4-cyclopentadiene (3) is prepared starting from 2,3,4,5-tetra-phenylcyclopentadien-1-one which forms 1-butyl-1-hydroxy-2,3,4,5-tetraphenylcyclopentadiene (1) by reaction with BuLi followed by acid hydrolysis. 1 and HBr give 1-bromo-1-butyl-2,3,4,5-tetraphenylcyclopentadiene (2), which in its turn reacts with BuLi and H 2 O /H +  to yield 3. Treatment of 3 with NaNH 2 , TlOEt or FeCl 2  yields Na[C 5 Ph 4 Bu] (4), Tl[C 5 Ph 4 Bu] (5) and the corresponding ferrocene Fe[C 5 Ph 4 Bu] 2  (6), respectively. The  1 H and  13 C NMR spectra of the new compounds are reported and discussed

zeitschrift für naturforschung b

Synthese von 1-Butyl-2,3,4,5-tetraphenyl-2,4-cyclopentadien und seiner Natrium-, Thallium(I)-und Eisen(II)-Komplexe / Synthesis of 1-Butyl-2,3,4,5-tetraphenyl-2,4-cyclopentadiene and its Sodium, Thallium (I) and Iron(II) Complexes