| Abstract |
Reactions of [ZrInd(NMe2)(3)] (1) with Me3SiCl afforded [ZrInd(NMe2)(2)Cl] (2), [ZrInd(NMe2)Cl-2] (3) and [ZrIndCl(3)](n) (4) in high yields (greater than or equal to 90\%). [ZrIndCl(3)(dme)] (5) was obtained either from 4 and dine or by a one-pot reaction from [ZrInd(NMe2)(3)], Me3SiCl and dine. Treatment of [ZrInd(NMe2)(2)Cl] with LiMe gave [ZrInd(NMe2)(2)Me] (6), and in similar reaction conditions [ZrInd(2)Me(2)] (10) was obtained from [ZrInd(NMe2)Cl-2]. Whereas the reaction of 2 with LiN(H)Bu-t produced \ZrInd(NMe2)(2)[N(H)Bu-t]\ (7), the addition of LiN(H)Bu-t to [TiInd(NMe2)(2)Cl] afforded [Ti(NMe2)(2)(p-(NBU)-B-t)](2) (9) in quantitative yield. \TiInd(NMe2)(2)-[N(H)Bu-t]\ was identified by NMR as an intermediate in the synthesis of 9, and two isomeric forms corresponding to the parallel (8a) and perpendicular (8b) orientations of the indenyl and N(H)Bu-t ligands were characterised. The addition of an excess of azetidine to 1 gave [ZrInd(2)(NC3H6)(2)] (11), the molecular structure of which was determined by X-ray crystallography. Preliminary studies showed that 3-methylaluminoxane (MAO) polymerises ethylene and propylene, whereas [TiInd(NMe2)Cl-2], 12-MAO, only polymerises ethylene. (C) 2001 Elsevier Science B.V. All rights reserved. |
