| abstract |
FIELD: chemistry. n SUBSTANCE: catalyst system for selective oligomerisation of ethylene, which contains a ligand in a P-C-C-P skeleton of formula 1, 2, 3 or 4, a chromium or molybdenum or tungsten compound and a promoter. Described also are a method of producing 1-hexene via selective trimerisation of ethylene and a method of producing 1-octene via selective tetramerisation of ethylene using said catalyst system. Catalyst activity is stable for a period of time sufficient for maintaining reaction rate constant. [Formula 1] (S,S)-enantiomer, [Formula 2] (R,R)-enantiomer, [Formula 3] (R,R)-1,2-trans-diphosphine enantiomer, [Formula 4] (S,S)-1,2-trans-diphosphine enantiomer. n EFFECT: method of producing 1-octene via selective tetramerisation of ethylene. n 7 cl, 4 tbl, 50 ex |