A family of phenoxy-imine-ether ligated Ti complexes for selective ethylene trimerization have been developed from highly active bis(phenoxy-imine) early transition metal ethylene polymerization catalysts. The Ti complexes, after activation with methylaluminoxane (MAO), selectively trimerized ethylene to produce 1-hexene with exceptionally high productivity under mild conditions (e.g., 1-hexene selectivity 93.3 wt%, productivity 31.9 kg of 1-hexene/mmol-Ti·h; ethylene pressure 0.8 MPa, 25 °C, 1 h). Substitutions on the phenoxy-imine-ether ligands have substantial effects on the catalytic properties of catalysts. DFT calculations gave relevant insights into the formation of a catalytically active Ti(II) species as well as that of 1-hexene from titana(IV)cycloheptane. This selective ethylene trimerization catalyst technology has already been commercialized at Mitsui Chemicals.

从高活性的双（苯氧基-亚胺）早期过渡金属乙烯聚合催化剂中已经开发出用于选择性乙烯三聚的苯氧基-亚胺-醚连接的Ti络合物家族。Ti络合物经甲基铝氧烷（MAO）活化后，在温和条件下选择性三聚乙烯，从而以极高的生产率生产1-己烯（例如1-己烯选择性为93.3 wt％，生产率为31.9 kg的1-己烯/ mmol-Ti· h；乙烯压力0.8 MPa，25°C，1 h）。苯氧基-亚胺-醚配体的取代对催化剂的催化性能有实质性影响。DFT计算提供了有关从钛（IV）环庚烷形成催化活性的Ti（II）物种和1-己烯的相关见解。