Synthesis and crystal structures of μ-1,3-bis(η(5)-tetramethylcyclopentadienyl)-1,1,3,3-etramethyldisiloxane)[η(2)-bis(trimethylsilyl)ethyne]titanium(II) and a doubly tucked-in product of its thermolysis
2002
Abstract
Reduction of dichloro-{1,3-bis(η(5)-tetramethylcyclopentadienyl)-1,1,3,3-tetramethyldisiloxane} titanium(IV), [T1Cl2{η(5):η(5)- (C5Me4SiMe2)(2)O}] (1), with magnesium in the presence of bis(trimethylsilyl)ethyne affords the ansa-[T-1{η(5):η(5)- (C5Me4SiMe2)(2)O}(η(2)-Me3SiC equivalent to CSiMe3)] (2) complex in high yield. Compound 2 is thermally robust, decomposing at 170 °C in high vacuum with liberation of 1,2-bis(trimethylsilyl)ethene to give predominantly an asymmetric, allydiene complex ansa-[Ti{(η(5)-C5Me4)SiMe2OSiMe2{η(3):η(4)-C5Me2(CH2)(2)}] (3) as a result of twofold C-H bond activation.
Crystal structures of 2 and 3 were determined by X-ray diffraction.