Attachment of the bulky bidentate ligand C(SiMe3)2SiMe2CH2CH2Me2si(Me3Si)2C to K Zn Sn and Yb. Crystal structures of LnMC(SiMe3)2Sime2CH2CH2Me2Si(Me3Si)2CMLn (MLn = K(C6H6)2 K(THF)2 SnCl3 or SnMe2Cl) and CH2SiMe2C(SiMe3)2ZnC(SiMe3)2SiMe2CH2 (THF = t

Eaborn, Colin, Hill, Michael S, Hitchcock, Peter B, Smith, J David, Zhang, S B and Ganicz, Tomasz (1999) Attachment of the bulky bidentate ligand C(SiMe3)2SiMe2CH2CH2Me2si(Me3Si)2C to K Zn Sn and Yb. Crystal structures of LnMC(SiMe3)2Sime2CH2CH2Me2Si(Me3Si)2CMLn (MLn = K(C6H6)2 K(THF)2 SnCl3 or SnMe2Cl) and CH2SiMe2C(SiMe3)2ZnC(SiMe3)2SiMe2CH2 (THF = t. Organometallics, 18 (12). pp. 2342-2348. ISSN 0276-7333

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Abstract

Reaction of the lithate [Li(THF)(4)][CH2SiMe2C(SiMe3)(2)LiC(SiMe3)(2)SiMe2CH2] with (KOBu)-Bu-t in THF has given the organopotassium reagent (THF)(2)KC(SiMe3)(2)SiMe2CH2CH2Me2Si(Me3Si)(2)CK(THF)(2), 8, and reaction of HC(SiMe3)(2)SiMe2CH2CH2Me2Si(Me3Si)(2)CH with KMe in benzene has given the related ether-free species (C6H6)(2)KC(SiMe3)(2)SiMe2CH2CH2Me2Si-(Me3Si)(2)CK(C6H6)(2), 7. The structures of 7 and 8 have been confirmed by X-ray studies which indicate that both compounds show K ... Me contacts in the range 3.3-3.5 Angstrom. The ether-free reagent 7 reacted with YbI2 in benzene to give the cyclic Yb(II) derivative CH2SiMe2(SiMe3)(2)YbC(SiMe3)(2)SiMe2CH2, which was found to be somewhat more stable toward Et2O than the I previously studied Yb{C(SiMe3)(3)}(2). Reaction of the lithate [Li(TMEDA)(2)][CH2SiMe2C(SiMe3)(2)LiC(SiMe3)(2)SiMe2CH2] (2a) with ZnCl2 in THF gave a cyclic compound CH2SiMe2C(SiMe3)(2)ZnC(SiMe3)(2)SiMe2CH2, which is stable toward boiling aqueous THF. An X-ray study shows that the angle at Zn is 170 degrees. In contrast, the reactions of 2a with SnCl4 or Me2SnCl2 gave linear species ClX2SnC(SiMe3)(2)SiMe2CH2CH2Me2Si(Me3Si)(2)CSnX2Cl, X = Cl or Me, the structures of which were confirmed by single-crystal X-ray diffraction studies.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: David Smith
Date Deposited: 06 Feb 2012 18:44
Last Modified: 19 Mar 2012 14:42
URI: http://sro.sussex.ac.uk/id/eprint/18083
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