22038-68-2Relevant academic research and scientific papers
Ligand-Assisted Catalysis: New Active and Selective Nickel Modified Homogeneous Catalysts for Linear Dimerization of Butadiene
Denis, Philippe,Mortreux, Andre,Petit, Francis,Buono, Gerard,Peiffer, Gilbert
, p. 5274 - 5276 (2007/10/02)
New aminophosphinite-modified Ni(0) catalysts have been found to be the most active ever described for linear dimerization of butadiene, affording almost exclusively 1,3,6- and 2,4,6-octatrienes, according to the reaction conditions.
Change of Selectivity in Catalytic Multicomponent Systems via Concentrations, Control of Metal-Catalyzed Reactions, Part XIII
Bartik, Tamas,Behler, Ansgar,Heimbach, Paul,Ndalut, Paulo,Sebastian, Joerg,Sturm, Harald
, p. 1529 - 1535 (2007/10/02)
By applying the method of inverse titration the influence of increasing concentrations of added effectors to organic and metalorganic chemical systems on the product selectivity can easily be identified.To a Wittig-type system we added LiI (change of stereoselectivity) and also triphenylphosphanoxide (removal of salt-effect).To a catalytic Ni(0)/butadiene system we added triphenylphosphite and then morpholine and vice versa.Ni:P(OC6H5)3:morpholine in a ratio 1:1:0.1 yields more than 90percent cyclodimers but in a ratio 1:0.1:20 more than 90percent n-octa-1,3,6-trienes.The co- oligomerisation of two butadienes with one 2,5-dimethyl-3-aza-hex-3-en in the system Ni/triphenylphosphane/butadiene/Schiff base/toluene/effector (1:1:66:33:66: ca. 0.1) leads - within the 2:1-cooligomers - by adding di-n-propyl-borane to a pure octadienylated Schiff base 11 or by adding morpholine largely to an octatrienylated amine 12 (ca. 85percent 12 and ca. 15percent 11). - Key words: Inverse Titration, Wittig Reactions, Butadiene/Schiff Base
