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The reaction of t -Bu 2 Si(OH) 2 with two equivalents of Cp 2 Zr(CH 3 ) 2 produces the title t -Bu 2 SiO 2 -siloxide bridged dimer, [Zr 2 (CH 3 ) 2 (C 5 H 5 ) 4 (C 8 H 18 O 2 Si)] or [Cp 2 Zr(CH 3 )]2[μ- t -Bu 2 SiO 2 ] ( 1 ), where one methyl group is retained per zirconium atom. The same product is obtained at room temperature even when equimolar ratios of the silanediol and Cp 2 Zr(CH 3 ) 2 are used. Attempts to thermally eliminate methane and produce a bridging methyl-ene complex resulted in decomposition. The crystal structure of 1 displays typical Zr-CH 3 and Zr-O distances but the Si-O distance [1.628 (2) Å] and O-Si-O angle [110.86 (15)°] are among the largest observed in this family of compounds suggesting steric crowding between the t -Bu substituents of the silicon atom and the cyclo-penta-dienyl groups. The silicon atom lies on a crystallographic twofold axis and both Cp rings are disordered over two orientations of equal occupancy.

(μ-Di-tert-butylsilanediolato)bis[bis(η5-cyclopentadienyl)methylzirconium]