Ansa-Metallocene Derivatves(Ⅱ)──Syntheses and Structures of Tetramethyldisiloxandiyl Bis(1-indenyl and tetrahydroindenyl)Zirconium Dichlorides

Abstract

Abstract: The ansa-zirconocene derivative tetramethyldisiloxandiyl bis(1-indenyl) zirconium dichloride(1) has been prepared by the reaction of the dilithium salt of 1,3-bis(1-indenyl) tetramethyldisiloxane with ZrCl₄·2THF.After catalytic hydrogenation,the corresponding tetrahydroindenyl complex(2) has been formed.Both 1 and 2 have been shown by¹H NMRspectra to be the mixture of the cis(meso) and trans(rac) isomers.The pure trans isomers 1_t,2_t and cis isomer 2_c were obtained by recrystallization. The crystal structures of 1_t and 2_c were determined by X-ray diffraction. Both crystals of 1_t and 2_c are monoclinics,belonging to space groups P2₁/n(1_t)and P2₁/c(2_c).In the unit cell of 2_c,one of the six-membered rings of the tetrahydroindenyl ligands has two different conformations which have the same probabilities.

Key words: ansa-Metallocene, X-ray diffraction, Zirconocene, Conformation

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WANG Bai-Quan, XU Shan-Sheng, ZHOU Xiu-Zhong, HU Ning-Hai. Ansa-Metallocene Derivatves(Ⅱ)──Syntheses and Structures of Tetramethyldisiloxandiyl Bis(1-indenyl and tetrahydroindenyl)Zirconium Dichlorides[J]. Chem. J. Chinese Universities, 1996, 17(2): 231.

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Ansa-Metallocene Derivatves(Ⅱ)──Syntheses and Structures of Tetramethyldisiloxandiyl Bis(1-indenyl and tetrahydroindenyl)Zirconium Dichlorides

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