REACTIONS OF (TRIMETHYLSILYL)TETRAMETHYLCYCLOPENTADIENE WITH (BENZENE)TITANIUM(II) BIS(TETRACHLOROALUMINATE) - CRYSTAL-STRUCTURES OF [C5ME4(SIME3)]TI(ALCL4)(2) AND ([C5ME4(SIME3)]TI(ALCL4)(MU-CL))(2)

(Trimethylsilyl)tetramethylcyclopentadiene C5HMe4(SiMe3) reacts with o ne equivalent of (C6H6)Ti(II)(AlCl4)(2) to give the paramagnetic trinu clear complex [C5Me4(SiMe3)]Ti(III)(AlCl4)(2) (1). At a five-fold mola r excess of C5HMe4(SiMe3), the paramagnetic binuclear complex [C5Me4(S iMe3)](2)Ti(III)(AlCl4) (2) and the diamagnetic centrosymmetric dimer {[C5Me4(SiMe3)]Ti(III)(AlCl4)(mu-Cl)}(2) (3) are obtained as a major a nd a minor product, respectively. The molecular structures of 1 and 3 have been obtained by X-ray crystal analysis. The structure of 2 has b een deduced from its ESR spectrum which shows the unpaired electron co upling to one Al nucleus. (C) 1998 Elsevier Science S.A.