This disclosure relates to a ligand compound, a catalyst system for olefin oligomerization, and a method for olefin oligomerization using the same. The catalyst system for olefin oligomerization according to the present invention has excellent catalytic activity, and yet, exhibits high selectivity to 1-hexene and 1-octene, thus enabling efficient preparation of alpha-olefin. The ligand compound is of the following Chemical Formula 1: ##STR00001## wherein at least one of R1 to R6 is a substituent of the following Chemical Formula
2: ##STR00002##

The present invention relates to a 1-octene composition. The 1-octene composition according to the present invention is prepared by ethylene oligomerization and comprises a high content of 1-octene and monomers useful for copolymerization of 1-octene at the same time.

This disclosure relates to a novel ligand compound that can oligomerize ethylene with high catalyst activity and selectivity, a catalyst system for olefin oligomerization including the same, and a method for olefin oligomerization using the same.

According to the present invention, there is provided a catalytic complex comprising a metal, one or more ligands and one or more counterions, wherein said one or more ligands include a non-racemic chiral ligand and wherein said one or more counterions include a triflimide counterion. Also provided are methods of making said catalytic complex and processes for producing chiral compounds which involve the use of said catalytic complex. In addition, the present invention provides compounds of the formula (2) as defined herein. The compounds of formula (2) may be useful as ligands in catalytic complexes.

Provided are ligand compounds selected from among N-(diphenylphosphino)-1,1-diphenyl-N-(4-phenylbutan-2-yl)phosphinamine and N.sup.4,N.sup.4-bis(diphenylphosphino)-N.sup.1,N.sup.1-diethylpentane-1,4-diamine, a catalyst system for olefin oligomerization, and a method for olefin oligomerization using the same. The catalyst system for olefin oligomerization has excellent catalytic activity, and yet, exhibits high selectivity to 1-hexene or 1-octene, thus enabling more efficient preparation of alpha-olefin.

Provided are ligand compounds containing two or more diphosphinoamine functional groups, where the two or more diphosphinoamine functional groups are linked by 4 carbon atoms, a catalyst system including the ligand compounds for olefin oligomerization, and a method for olefin oligomerization using the same. The catalyst system for olefin oligomerization according to the present invention has excellent catalytic activity, and yet, exhibits high selectivity to 1-hexene and 1-octene, thus enabling efficient preparation of alpha-olefin.

The invention describes a novel dissymmetric nickel-based complex and the method of preparation thereof from at least one diphosphinamine ligand B1 of formula (R.sup.1)(R.sup.1)PN(R.sup.3)P(R.sup.2)(R.sup.2), or an iminobisphosphine ligand B2 of formula (R.sup.3)NP(R.sup.1)(R.sup.1)P(R.sup.2)(R.sup.2). The invention also concerns the use of said complex in a method for oligomerisation of olefins.

The present invention relates to a ligand compound, a catalyst system for ethylene oligomerization, and a method for ethylene oligomerization using the same. The catalyst system for ethylene oligomerization according to the present invention not only has excellent catalytic activity but also shows more improved liquid olefin selectivity, and enables more effective preparation of an alpha-olefin through the oligomerization of ethylene because it is particularly possible to control the selectivity to 1-hexene or 1-octene.

Processes of polymerizing olefin monomers using catalyst systems and catalysts systems that include a procatalyst having a structure according to formula (I): ##STR00001##

Processes of polymerizing olefin monomers using catalyst systems and catalysts systems that include a procatalyst having a structure according to formula (I). ##STR00001##