《Table 2 Oligomerizations activated by the reaction products of C6H5OH/4-t BuPhOH, AlMe3 and water a

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《Preparation of Aryloxy-aluminoxanes and Their Use as Activators in the Bis(imino)pyridyl Iron-catalyzed Oligomerization of Ethylene》

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a General conditions:pre-cat.:L-Fe（acac）3，[Fe]=2μmol；[Al]/[Fe]=2000；solvent:toluene，50 mL；T=50°C；P=0.1 MPa；t=30 min；b The mass fraction of insoluble polymers in the total products；c Total activity:kg/ （mol Fe·h）

To further verify the activation effectiveness of the aryloxyaluminoxanes for iron-catalyzed ethylene oligomerization，unsubstituted phenol（C6H5OH）and para-alkyl substituted phenol（4-t BuPhOH）were also employed to prepare the correspondingphenoxy-aluminoxanes.Hereby，the[H2O]/[Al]molar ratio used in the hydrolysis procedure was fixed at 0.7.As shown in Table 2，these aluminoxanes also serve as highly effective activators；the activities and the polymer-retarding abilities are close to those of the 4-Brphenoxy-aluminoxanes.As expected，the[―OH]/[Al]molar ratio adopted in the first step of reaction with AlMe3has very significant impacts on the catalytic activity，olefin distribution，and most importantly the polymer formation.There is a sharp reduction of the polymer yields as the[―OH]/[Al]ratio increases from 0.1 to 0.7.In these cases，[―OH]/[Al]=0.5 continues to be the optimized value，which can largely retard the polymer production and maintain the activity at a high level.