A fulvene route to group 4 metallocene complexes bearing 4,7-bis(dimethylamino)-substituted indenyl ligands

Sierra J.C.; Kehr S.G.; Fröhlich R.; Erker G.

Abstract

N,N,N′,N′-Tetramethylsuccinamide (15) was selectively converted into the functionalized aminofulvene 16. Subsequent treatment with reagent 17, [ZrCl2(NMe2)2(L)2] (L = THF or 0.5 DME), resulted in the formation of the cyclization product 4,7- bis(dimethylamino)indene (21). Deprotonation with n-butyllithium, followed by the reaction of the resulting substituted indenyllithium reagent 22 with ZrCl4, gave the metallocene [4,7-bis(dimethylamino)indenyl] 2ZrCl2 (23). The reaction of 22 with ZrCl3Cp furnished the complex [4,7-bis(dimethylamino)indenyl]CpZrCl2 (24). Fulvene 16, as well as the metallocene dichlorides 23 and 24, were characterized by X-ray diffraction. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.