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- W2050176304 abstract "Source o f material: A n amount o f 0 . 4 7 g ( 1 . 0 m m o l ) o f Ср22г(ру)(л^-Мез81С251Мез) (see ref. 1 ) was dissolved in 15 ml of n-hexane and 0 . 3 2 g (2 .0 mmol ) of PhC2SiMe2H were added. After stirring 4 h at 3 1 3 K the orange solution became yel low. All solvents were distilled o f in vacuum and the residue was dissolved in 2 0 ml o f 3:1 n-hexane/THF mixture. After standing 5 days at 2 7 3 К ye l low needles appeared. The mother liquor was decanted, the crystals washed with cold n-hexane and dried in vacuum; yield 0.21 g (76%), m p 4 3 3 K. The regioselect ivity of the coupling reaction of PhC2SiMe3 with zirconocene (see re f 2) and titanocene (see ref. 3) is wel l investigated to g ive in the first step the kinetically favoured metallacyclopentadienes with one S iMes group in the a and one in the s-posit ion to the metal. These product rearrange by cyc loreversion to g i v e the thermodynamically more stable product with both S i M e s groups in the a-posit ion. The other alkyne PhC2SiMe2H shows a similar reaction behaviour (see ref. 4). In order to look for an interaction of Si-H-groups with the metal ( see ref 4 ) the title compound was investigated by X-ray crystal structure analysis. N o interaction of the Si-H-group with the metal atom was found." @default.
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- W2050176304 date "1998-04-01" @default.
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- W2050176304 title "Crystal structure of 2,2-bis(η5 -2,4-cyclopentadiene-1-yl)-2,5-bis(dimethylsilyl)-3,4-bis(phenyl)zirconacyclopentadiene, C30H34Si2Zr" @default.
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- W2050176304 doi "https://doi.org/10.1524/ncrs.1998.213.14.829" @default.
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