Patent ID: 7368622
Filing Date: 2008-05-06
Classification: A23P,A61K,C07C,Y02P

Abstract:
1. A 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; the above first step being carried out in the presence of a hydrogen donor; a second step (b) in which the partial catalytic hydrogenation of 1,7-octadiene, recovered at the end of the first step, to 1-octene, is effected; the above hydrogenation being carried out in an inert solvent, under hydrogen pressure or mixtures of hydrogen and nitrogen, in the presence of a catalyst; the above process being characterized in that: (i) in the first step the aprotic polar solvent is selected from disubstituted cyclic ureas having general formula (I) wherein n ranges from 1 to 8; R R (ii) in the second step the catalyst is selected from non-supported ruthenium complexes having general formula (II): wherein: X is selected from Cl, Br, I, CH L is selected from monodentate or bidentate neutral ligands; m ranges from 1 to 3; n ranges from 2 to 4.