Highly Selective Diphoshinoamine/Cr(Ⅲ) Catalysts for Ethylene Tetramerization

Two novel diphoshinoamine ligands have been synthesized. Combination of Cr(Ⅲ)and methylaluminoxane(MAO) generated active catalytic system which can catalyze tetramerization of ethylene with high catalytic activity up to 2.5×10 g/mol Cr.h and high selectivity to produce 1-octene (C8 in products is being 89.80 wt%).