F. Jager et al., METALLACYCLODISILADIAZANES OF TITANIUM AND ZIRCONIUM - SYNTHESIS, STRUCTURE AND POLYMERIZATION STUDIES, Chemische Berichte, 130(3), 1997, pp. 399
A series of metallacyclodisiladiazanes has been prepared. Lithiated (S
iMe(2)NHtBu)(2) (1) reacts with TiCI4 . 2 THF to give (SiMe(2)NtBu)(2)
TiCl2 (4). Methylation or fluorination of 4 leads to (SiMe(2)NtBu)(2)T
iMe(2) (8) and (SiMe(2)NtBu)(2)TiF2 (9), respectively. The reaction of
ZrCl4 . 2 THF with lithiated 1 or [SiMe(2)NH(4-FC6H4)](2) (2) yields
(SiMe(2)NtBu)(2)ZrCl2 (5) and [SiMe(2)N(4-FC6H4)]2ZrCl2 . THF (7), res
pectively. The lithiated ligand [SiMe(2)NH(2,6-iPr(2)C(6)H(3))](2) (3)
reacts with noncoordinated ZrCl4 to give [SiMe(2)N(2,6-iPr(2)C(6)H(3)
)]2ZrCl2 (6). X-ray structural analysis of 9 showed it to be a fluorin
e-bridged dimer in the solid state. Compounds 4, 6, 8 and 9 were found
to be catalysts for the polymerization of ethylene.