Abstract: The chiral ansa-metallocene derivative sila-bridged bis(1-indenyl)titanium dichloride(Me₂SiOSiMe₂)[Ind]₂TiCl₂(1)has been prepared by the reaction of the dilithium salt of 1,3-bis(1-indenyl) tetramethyl disiloxane with TiCl₄·2THF.After catalytic hydrogenation,1 has been converted to the corresponding tetrahydroindenyl complex (Me₂SiOSiMe₂)·[IndH₄]₂TiCl₂(2).The crystal structures of 1 and 2 have been determined by X-ray diffraction analysis.Both the crystals belong to monolinic, space group P2₁/n.For 1,a=1.0546(4)nm,b=1.3773(7)nm,c=1. 5493(5) nm;β=99.05(3)°,V=2.222(1)nm³,Z=4,D_c=1.43 g/cm³,R=0.033.For 2, a=1.0911(2)nm,b=1.3815 (3)nm,c=1.5886(2)nm;β=101. 39 (1)°,V=2.347(1)nm³,Z=4,D_c=1.378g/m³,R=0.053.

Key words: Sila-bridged bis(1-indenyl)titanium dichloride, X-ray diffraction analysis, Ansa-metallocene