FIELD: chemistry.
SUBSTANCE: invention relates to a method of maintaining stable catalytic activity during tetramerisation of ethylene and a method of producing 1-octene via tetramerisation of ethylene. Tetramerisation is carried out in the presence of a catalyst system containing chromium or a chromium precursor, alkylaluminoxane and a ligand with the backbone structure P-C-C-P, of formula 
1, where R1, R2, R3 and R4 each independently denotes phenyl or substituted phenyl and R1, R2, R3 and R4 each does not have substitutes on atoms neighbouring atoms bonded with P atoms, and R5, R6 denote a methyl group.
EFFECT: disclosed methods enable stable sustenance of catalytic activity compared to ordinary catalyst systems.
2 cl, 2 dwg, 2 tbl, 17 ex
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