Process for the preparation of 1-octene

C - Chemistry – Metallurgy – 07 – C

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C07C 2/40 (2006.01) C07C 5/05 (2006.01)

Patent

CA 2543065

Process in two steps for the preparation of 1-octene starting from butadiene which comprises: a first step (a) in which the bis-hydrodimerization of butadiene to 1,7-octadiene is effected in the presence of a catalyst based on a palladium complex containing one or more tri-substituted monodentate phosphines, in an aprotic polar solvent optionally containing an organic base; a second step (b) in which the partial catalytic hydrogenation of 1,7- octadiene to 1-octene is effected, the above process being characterized in that: (i) in the first step the aprotic polar solvent is selected from disubstituted cyclic ureas; (ii) in the second step the catalyst is selected from non~ supported ruthenium complexes having general formula (I I): RuXmLn (I I).

L'invention concerne un procédé en deux étapes pour préparer du 1-octène à partir de butadiène, ce procédé consistant à effectuer, dans une première étape, la bis-hydrodimérisation du butadiène en 1,7-octadiène, en présence d'un catalyseur à base d'un complexe de palladium contenant une ou plusieurs phosphines monodentate tri-substituées dans un solvant polaire aprotique contenant éventuellement une base organique et, dans une seconde étape, l'hydrogénation catalytique partielle du 1,7-octadiène en 1-octène. L'invention est caractérisée en ce que, dans la première étape, le solvant polaire aprotique est sélectionné parmi des urées cycliques disubstituées et, dans la seconde étape, le catalyseur est sélectionné parmi des complexes de ruthénium non supporté de formule (II): RuX¿m?L¿n? (II).

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