New Group 4 metal t-butyldimethylsilyleyclopentadienyl complexes [MCpCp'Cl-2] (Cp = eta(5)-C5H5 : Cp' = eta(5)'-C5H4SiMe2',Bu; M = Ti 4, Zr 5, Hf 6) were prepared by reaction of 1 equiv. of the lithium (2) and thallium (3) salts of t-butyldimethylsilylcyclopentadiene I with the monocyclopentadienyl complexes [MCpCl3. DME] (M = Zr, Hf) and [TiCpCl3], respectively, A similar reaction using ZrCl4(THF)2 and HfCl4 with 2 equiv. of the lithium salt 2 gave the symmetric [MCp2Cl2] (M = Zr 7, Hf8) rnetallocenes. Alkylation of these compounds with 2 equiv. of MgRCl (R = Me. CH2Ph) and Li(CH2CMe2Ph) afforded the dialkyl complexes [MCpCp'R-2] (R = Me, M = Zr 9, Hf 10: R = CH2Ph. M = Ti 11. Zr 12. Hf 13). [ZrCp2(CH2Ph):] 14 and [ZrCpCp'(CH2CMe2Ph)(2)] 17, A Similar reaction of 5 with 1 equiv. of Mg(CH2Ph)Cl gave the monobenzyl compound [ZrCpCp'Cl(CH2Ph)] (15), Hydrolysis of 15 with a stoichiometric amount of water afforded the dinuclear mu-oxo compound [(ZrCpCp'Cl)(2)(mu-O)] (16). All of the new complexes reported were characterized by elemental analysis and H-1 and C-13 NMR spectroscopy and the molecular structures of 4 and 16 were determined by X-ray diffraction methods. Ethylene polymerization activities were measured for compounds 4-7. (C) 2002 Elsevier Science B.V. All rights reserved.
JONES, P. R.;ROZELL, J. M. ,, JR.;CAMPBELL, B. M., ORGANOMETALLICS, 1985, 4, N 8, 1321-1324
作者:JONES, P. R.、ROZELL, J. M. ,, JR.、CAMPBELL, B. M.
DOI:——
日期:——
Synthesis and characterization of trimethylsilylmethyl-, bis(trimethylsilyl)methyl-and silyl-substituted cyclopentadienes and their alkali metal complexes1Dedicated to Professor Ken Wade, as a mark of friendship and as a recognition of his many contributions to chemistry.1
作者:Michael A Edelman、Peter B Hitchcock、Michael F Lappert、Dian-Sheng Liu、Shun Tian
DOI:10.1016/s0022-328x(97)00559-7
日期:1998.1
4, Na5 or K 6), NaCpt7 or MCptt (M=Li 8 or K 9). Treatment of 6 with (Me3Si)2CHBr produced C5H4[CH(SiMe3)2]210 (CpRRH). Addition of Me2NCH2CH2NMe2 (TMEDA) to 4 or 8 afforded [LiCpR(TMEDA)] 11 or [LiCptt(TMEDA)] 12. From 6 and Me2SiCl2 Me2Si[C5H4CH(SiMe3)2]213 [Me2Si(CpRH)2] was obtained and converted into its potassium salt Me2Si(CpRK)214. Metallation of C5H3(SiMe3)3 (Cp‴H) with LiBun, NaNH2 or
of singlet and triplet 2-silylcyclopentane-1,3-diyls and their reactivity have been investigated in the thermal and photochemical denitrogenation of 2,3-diaza-7-silylbicyclo[2.2.1]hept-2-ene. 5-Silylcyclopentene (silyl migration product) is quantitatively obtained, while 5-silylbicyclo[2.1.0]pentane (intramolecular ring-closure product) is not detected in the denitrogenation reactions. Deuterium labeling