Comparative study of new chromium-based catalysts for the selective tri- and tetramerization of ethylene
作者： Stefan Härzschel , Fritz E. Kühn , Anina Wöhl , Wolfgang Müller , Mohammed H. Al-Hazmi
DOI: 10.1039/C4CY01441C
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摘要: Two new ligands, Ph2PN(iPr)P(Ph)N(c-Hex)(CH3) (2) (Ph = phenyl, iPr isopropyl, c-Hex cyclohexyl) and Ph2PN(c-Hex)P(Ph)NEt(CH3) (Et ethyl) (3) were synthesized. 2 was characterized by X-ray analysis. To compare their applicability with the previously known Ph2PN(iPr)P(Ph)N(iPr)H (1) these ligands investigated together chromium(III)acetylacetonate, different co-catalysts solvents for catalytic oligomerization of ethylene. The in situ prepared catalysts proved to be highly active, yielding pure 1-octene as main product 1-hexene byproduct. It possible reach productivities several hundred kg per gram chromium hour, up almost 65 wt% about 99% purity overall plus yields more than 85 wt%.
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