FIELD: chemistry.
SUBSTANCE: present invention relates to a catalyst composition and a method for di-, tri- and/or tetramerisation of ethylene. The catalyst composition contains a chromium compound, a ligand of general formula (A) R1R2P-N(R3)-P(R4)-N(R5)-H or any cyclic derivatives (A). At least one of P or N atoms in the PNPN group is a member of a ring system, where that ring system is formed from one or more component compounds of structures (A) through substitution, and a cocatalyst or activator. The method and composition enable to produce 1-hexene with a long cycle of active operation of the catalyst and high selectivity. No broad distribution of the obtained LAO is observed and formation of polymers is well suppressed.
EFFECT: ensuring high purity of the product without additional purification steps at the extraction line.
17 cl, 2 ex, 1 tbl, 1 dwg
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