New titaniumcomplexes of general formula [(ArO)nTi(Oi-Pr)(4−n)] were synthesized and used as pre-catalysts for the selectivedimerization of ethylene to 1-butene. The complexes were prepared in cyclohexane using [Ti(Oi-Pr)4] and one or two equivalents of the corresponding phenols (ArOH) at room temperature. In this work, both monodentate and chelating phenols were evaluated. For alkyl-substituted
合成了新的通式[(ArO)n Ti(O i -Pr)(4- n) ]的钛配合物,并将其用作乙烯选择性二聚为氯代甲烷的预催化剂。1-丁烯。复合物是在环己烷使用钛[Ti(O我-Pr)4 ],在室温下相应的酚类(aroH的)的一个或两个当量。在这项工作中,评估了单齿酚和螯合酚。对于烷基取代的苯酚,它证明了在两个大的空间位阻的邻和邻'位选择性地得到单取代物[(ARO)的Ti(O我-Pr)3 ]。取代只在其中一个邻位允许两个单-和二-取代的钛复合物的位置,以进行分离。当在苯酚骨架引入的杂原子,二取代发生系统除了与酚呈现hemilabile -CH 2 NR2组在邻位。在用3当量活化。ALET的3在20巴和60℃下,所有的复合物选择性地二聚乙烯1-丁烯 (> 86%的丁烯,其中99% 1-丁烯)。与[Ti(O i -Pr)4 ]相比,配体邻位的空间体积增加或官能团的引入导致活性降低。