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Oligomérisation anionique de l'éthylène, 4. Etude cinétique de la réaction amorcée par le complexe sec ‐butyllithium‐tétraméthyléthylènediamine

1980; Wiley; Volume: 181; Issue: 7 Linguagem: Inglês

10.1002/macp.1980.021810706

0025-116X

Matt Aldissi, François Schué, Kurt E. Geckeler, Marc J.M. Abadie,

Organometallic Complex Synthesis and Catalysis

Abstract The oligomerization of ethylene in hexane, initiated by sec ‐butyllithium ( sec ‐BuLi) complexed with tetramethylethylenediamine (TMEDA) was studied. The half‐order reaction in [ sec ‐BuLi‐TMEDA] and [PELi‐TMEDA] (PELi = (polyethylene)lithium) supports the presence of aggregated dimer species. For the initiation as well as the propagation, a dissociation of these dimers ( sec ‐BuLi‐TMEDA) 2 and (PELi‐TMEDA) 2 has to be considered, the monomeric form being the only active one. The higher reactivity of sec ‐BuLi compared to PELi can be explained partly by a secondary carbanionic structure compared to a primary one.