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1,4-Diphenyl-1,3-cyclopentadiene reacts with acyl chlorides RC(O)Cl (R = CH 3  (a), C 5 H 11  (c )) to form the corresponding 1,4-bis(4-acylphen-1-yl)-1,3-cyclopentadienes C 5  H 4  (C 6 H 4  C(O)R) 2  (1a, 1c), which upon treatment with NaNH 2  or with TlOC 2 H 5  afford the corresponding sodium complexes Na[C 5 H 3  (C 6 H 4 C(O)R) 2 ] (2a, 2c) or thallium(I) derivatives Tl[C 5 H 3  (C 6 H 4 C(O)R) 2 ] (3a, 3c). The reaction of 1,1′,3,3′-tetraphenylferrocene with CH 3 C(O)Cl results in the formation of Fe[C 5 H 2  {C(O)CH 3 } {(C 6 H 4 C(O)CH 3 ) 2 }]- [C 5 H 3  {(C 6 H 4 C(O)CH  3 ) 2 }] (5), whereas 2c and FeCl 2  give Fe[C 5 H 3 (C 6 H 4 C(O)C 5 H 11 ) 2 ] 2  (4c). The all-para-acylated tetraphenylcyclopentadienes C 5 H 2  (C 6 H 4 C(O)R) 4  (R = CH 3  (a), C 3 H 7  (b)) react with K[N 2 H 4 OH] to produce the ligands C 5 H 2 (C 6 H 4 CH 2 R) 4  (6a, 6b), which undergo reactions with NaNH 2  and TlOC 2 H 5  to yield the sodium and thallium(I) salts, Na[C 5 H 2 (C 6 H 4 CH 2 R) 4 ] (7a, 7b) and Tl[C 5 H 2 (C 6 H 4 CH 2 R) 4 ] (8a, 8b), respectively. 7a and 7b react with FeCl 2  to produce the corresponding ferrocenes Fe[C 5 H(C 6 H 4 CH 2 R) 4  ] 2  (9a, 9b). The  1 H and  13 C NMR spectra of the new compounds are reported and discussed

zeitschrift für naturforschung b

1,4-Bis(4-acylphen-1 -yl) 1,3-cy clopentadiene und 1,2,3,4-Tetra(4-alkylphen-1-yl)-1,3-cyclopentadiene und deren Natrium-, Thallium(I)- und Eisen(II)-Komplexe / 1,4-Bis(4-acylphen-1-yl)-1,3-cyclopentadienes and 1,2,3,4-Tetra(4-alkylphen-1-yl)- 1,3-cyclopentadienes and their Sodium, Thallium (I) and Iron(II) Complexes