Synthesis of Titanatranes Containing Bis(aryloxo)‐(alkoxo)amines and their Use in Catalysis for Ethylene Polymerization

Syntheses of titanatranes containing [(O‐2,4‐Me 2 C 6 H 2 ‐6‐CH 2 ) 2 ‐{O(CH 2 ) n CH 2 }]N 3− (n = 1,2) have been explored. Catalytic activity for ethylene polymerization by Ti 2 (O i Pr) 2 {[(O‐2,4‐Me 2 C 6 H 2 ‐6‐CH 2 ) 2 (µ 2 ‐OCH 2 ‐CH 2 )]N} 2 ( 1a ) ‐ MAO catalyst increased at high temperature; the activity also increased upon addition of AlMe 3 . Ti(O‐ 2,6‐ i Pr 2 C 6 H 3 ){[(O‐2,4‐Me 2 C 6 H 2 ‐6‐CH 2 ) 2 (OCH 2 CH 2 )]N} ( 1c ) showed higher activity than 1a under the same conditions. Ti{[(O‐2,4‐Me 2 C 6 H 2 ‐6‐CH 2 ) 2 (HOCH 2 CH 2 CH 2 )]N} 2 was isolated from the reaction of Ti(O i Pr) 4 with bis(2‐hydroxy‐3,5‐dimethylbenzyl)‐propanolamine; the structure was determined by X‐ray crystallography.