The present invention concerns a method for the hydrosilylation of an unsaturated compound comprising at least one ketone function, one aldehyde function, one alkene function and/or one alkyne function, with a compound comprising at least one hydrogen-silyl function implementing an organic catalyst of tri-coordinated germanium.

The present invention relates to a catalyst composition and a process for the oligomerization of ethylene to produce 1-hexene or 1-octene, wherein the catalyst composition comprises a chromium compound; an NPNPN ligand of the formula (R.sup.1) (R.sup.2)NP(R.sup.3)N(R.sup.4)P(R.sup.5)N(R.sup.6)(R.sup.7), wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are each independently hydrogen, halogen, amino, trimethylsilyl or C.sub.1-C.sub.20 hydrocarbyl, preferably straight-chain or branched C.sub.1-C.sub.10 alkyl, phenyl, C.sub.6-C.sub.20 aryl or C.sub.6-C.sub.20 alkyl-substituted phenyl.

The present invention relates to a compound of formula (I) and salts thereof,

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The present invention further relates to catalytic complexes comprising a compound of formula I and uses thereof in the stereoselective synthesis of stereocentres, in particular, all-carbon quaternary stereocentres.

The present invention relates to a method for preparing an oligomerization catalyst system and the method comprises preparing a catalyst composition by mixing a PNP-based ligand compound and a transition metal compound, and mixing and activating a co-catalyst and the catalyst composition at a temperature from 40 to 80 C. The oligomerization catalyst system prepared by the method may maintain the activity thereof during an oligomerization reaction at a high temperature, and the reaction temperature of oligomerization may be easily controlled. Various merits in processing may be obtained.

Catalyst systems suitable for tetramerizing ethylene to form 1-octene may include a catalyst including a chromium compound coordinated with a ligand and a co-catalyst including an organoaluminum compound. The ligand may have a chemical structure according to Formula (1), wherein R.sup.1 is a (C.sub.3-C.sub.20) substituted or unsubstituted hydrocarbyl group; R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are independently chosen from (C.sub.1-C.sub.50) hydrocarbyl groups; and R.sup.1 and N are in a cis configuration.

The present invention relates to a method for oligomerization of ethylene, comprising the steps: a) feeding ethylene, solvent and a catalyst composition comprising catalyst and cocatalyst into a reactor, b) oligomerizing ethylene in the reactor, c) discharging a reactor effluent comprising linear alpha-olefins including 1-butene, solvent, unconsumed ethylene dissolved in the reactor effluent, and catalyst composition from the reactor, d) separating ethylene and 1-butene collectively from the remaining reactor effluent, and e) recycling at least a part of the ethylene and the 1-butene separated in step d) into the reactor.

The method for oligomerizing olefin according to the present disclosure is a method for oligomerizing olefin using an oligomerization catalyst system and includes deteriorating the activity of the oligomerization catalyst system by injecting a deactivator in a latter part of a multimerization reaction of olefin. The deactivator may include an additive for polymer containing at least one functional group selected from the group consisting of a hydroxyl group, an amine group and an amide group. According to the oligomerizing method, the isomer of 1-hexene and/or 1-octene and alpha-olefins with C.sub.10 to C.sub.40 may be decreased via the restraint of the additional side reaction of a product. Since the deactivator is an additive for enhancing the physical properties of a polymer, a separating process thereof is not required, thereby improving economic feasibility and productivity.

The present invention relates to a catalyst composition and a process for the oligomerization of ethylene to produce 1-hexene or 1-octene, wherein the catalyst composition comprises a chromium compound; an NPNPN ligand of the formula (R.sup.1) (R.sup.2)NP(R.sup.3)N(R.sup.4)P(R.sup.5)N(R.sup.6)(R.sup.7), wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are each independently hydrogen, halogen, amino, tri-methylsilyl or C.sub.1-C.sub.20 hydrocarbyl, preferably straight-chain or branched C.sub.1-C.sub.10 alkyl, phenyl, C.sub.6-C.sub.20 aryl or C.sub.6-C.sub.20 alkyl-substituted phenyl.

Spirocyclic compounds, including chiral spiro diamine, chiral spiro amino naphthol, chiral spiro bis(indole), chiral spiro diaryl diol, chiral spiro diaryl diamine, chiral spiro amino naphthol, chiral spiro diaryl diindole, and chiral spiro phospholane useful as chiral ligands and chiral organocatalysts and methods of preparation and methods of use thereof. Owing to the molecular shape and three-dimensional orientation, the chiral diamine and chiral amino naphthol molecules provide a skeleton for use as ligands and organocatalysts.

Catalyst systems suitable for tetramerizing ethylene to form 1-octene may include a catalyst including a chromium compound coordinated with a ligand and a co-catalyst including an organoaluminum compound. The ligand may have a chemical structure according to Formula (1), wherein R.sup.1 is a (C.sub.3-C.sub.20) substituted or unsubstituted hydrocarbyl group; R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are independently chosen from (C.sub.1-C.sub.50) hydrocarbyl groups; and R.sup.1 and N are in a cis configuration.