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Me 3 Si-substituted indenes of type 1-SiMe 3 -3,4-(CH 2 ) 3 C 9 H 5  (9), 1-SiMe 3 -4-R-7-R′C 9 H 5  (11a, R = R′ = Me; 11b, R = R′ = Ph; 11c, R = Me, R′′ = Ph) and 1,1′ -(SiMe 3 ) 2 -4,7-Me 2 C 9 H 4  (12) were synthesised as precursors for piano-stool type halfsandwich indenyl-titanium trichloride complexes.Treatment of 9, 11, and 12 with equimolar amounts of TiCl 4  gives the complexes (η 5 -3,4-(CH 2 ) 3 C 9 H 5 )TiCl 3  (13), (η 5 -4-R-7-R′C 9 H 5 )TiCl 3  (14a, R =R′ = Me; 14b, R =R′= Ph; 14c, R = Me, R′ = Ph), and (η 5 -1-SiMe 3 -4,7-Me 2 C 9 H 4 )TiCl 3  (15), respectively, with liberation of Me 3 SiCl.Detailed UV/vis spectroscopic and cyclic voltammetric studies were carried out which allow a comparison of substituent effects in 13 - 15.

zeitschrift für naturforschung b

3,4-, 4,7- und 1,4,7-substituierte Indenyl-TiCl 3 -Komplexe: Synthese und vergleichende Diskussion der Substituenteneinflüsse / 3,4-, 4,7- and 1,4,7-Substituted Indenyl-TiCl 3  Complexes: Synthesis and Comparison of Substituent Effects