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Pentaphenylcyclopentadiene (1) reacts with acyl chlorides RC(O)Cl (R = CH 3 , C 3 H 7 , C 5 H 11 , C 7 H 15 ) with formation of the corresponding [(cyclopentadiene pentayl)pentakis] (1,4-phenylene) alkanones C 5 H(C 6 H 4 C(O)R-4) 5  (2a, 2c, 2d and 2e). 2 a reacts with KOCl in water/dioxane to yield C 5 Cl(C 6 H 4 C(O)OH-4) 5  (3), which after reaction with C 2 H 5 OH and C 5 H 11 OH gives the pentaesters C 5 Cl(C 6 H 4 C(O)OR-4) 5  (4b and 4d), and after reaction with (CH 3 ) 3 SnH the corresponding [(cyclopentadiene pentayl)pentakis] benzoic acid pentaalkyl esters C 5 H(C 6 H 4 C(O)OR-4) 5  (5b and 5d). Reaction of 2a, 2c, 2d, 2e and 5b with NaNH 2  results in the formation of the sodium salts Na[C 5 (C 6 H 4 C(O)R-4)5] (6a, 6c, 6d and 6e) and Na[C 5 (C 6 H 4 C(O)OC 2 H 5 -4)5] (7). 2a, 2c, 2d, 2e, 5b and 5d react with TlOC 2 H 5  to give the thallium(I) derivatives Tl[C 5 (C 6 H 4 C(O)R-4) 5 ] (8a, 8c, 8d, 8e) and Tl[C 5 (C 6 H 4 C(O)OR-4) 5 ] (9b and 9d). The  1 H and  13 C NMR spectra of the new compounds are reported and discussed.

zeitschrift für naturforschung b

1-[4-{1,1′,1″,1‴,1′′′′-(1,3-Cyclopentadien-1,2,3,4,5-pentayl)pentakis}]-(4,1-phenylen)-alkanone und -benzoesäure pentaalkylester und deren Natrium- und Thallium(I)-Komplexe / 1-[4-{1,1′,1″,1‴,1′′′′-( 1,3-Cyclopentadiene-1,2,3,4,5-pentayl)pentakis}]-(4,1-phenylene)-alkanones and -benzoic Acid Pentaalkyl Esters and their Sodium- and Thallium(I) Complexes