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Synthesis and structural characterisation of new ansa -bis(propene)s and ansa -bis(allyl) alkali metal and ansa -bis(allyl) transition metal complexes

journal contribution
posted on 2023-06-07, 22:17 authored by Rafael Fernandez Galan, Peter B Hitchcock, Michael F Lappert, Antonio Antinolo, Ana M Rodriguez
The new ansa-bis(propene)s, R2Si(CH2CH[double bond, length half m-dash]CHSiR'3)2 (R = R' = Me 1; R = Ph, R' = Me 2; R = R' = Ph 3; R = Me, R' = Ph 4; R = Me, R' = Me2But5) have been prepared by lithiation of the appropriate 3-silylpropene and quenching with SiCl2R2 (R = Me or Ph). The ?3-ansa-bis(allyllithium) compounds [{Li(tmen)}2{3-(?3-C3H3SiR'3-1)2}SiR2] (R = R' = Me 6; R = Ph, R' = Me 7; R = R' = Ph 8; R = Me, R' = Ph 9; R = Me, R' = Me2But10) complexes were obtained from of the appropriate ansa-bis(propene) and LiBun. The lithium complex 6 was transformed into the potassium complex [K2{3-(?3-C3H3SiMe3-1)2SiMe2}] 11 and into [Hf{3-(?3-C3H3SiMe3-1)2SiMe2}2] 13 by reaction with KOBut or HfCl4, respectively. From 11 and ZrCl4 [Zr{3-(?3-C3H3SiMe3-1)2SiMe2}2] 12 was obtained. Single crystal X-ray structures of complexes 4, 6 and 12 are presented. Complex 12, in presence of methylaluminoxane (MAO), was an active catalyst for the polymerisation of ethylene.

History

Publication status

  • Published

Journal

Journal of the Chemical Society, Dalton Transactions

Publisher

Royal Society of Chemistry

Volume

11

Page range

1743 - 1749

ISBN

1470-479X

Department affiliated with

  • Chemistry Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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