ARTICLE
This journal isTwo new ligands, Ph 2 PN(iPr)P(Ph)N(c-Hex)(CH 3 ) (2) (Ph = phenyl, iPr = isopropyl, c-Hex = cyclohexyl) and Ph 2 PN(c-Hex)P(Ph)NEt(CH 3 ) (Et = ethyl) (3) were synthesized. 2 was characterized by X-ray analysis. To compare their applicability with the previously known Ph 2 PN(iPr)P(Ph)N(iPr)H(1) these ligands were investigated together with chromium(III)acetylacetonate, different co-catalysts and solvents for the catalytic oligomerization of ethylene. The in situ prepared catalysts proved to be highly active, yielding highly pure 1-octene as the main product and 1-hexene as the main byproduct. It was possible to reach productivities of several hundred kg product per gram chromium and hour, up to almost 65 wt % 1-octene with about 99 % purity and overall 1-hexene plus 1-octene yields of more than 85 wt %.
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