Synthesis of various titanatrans and their application as olefin polymerization catalysts

Abstract

Syntheses of titanatranes containing [(O-2,4-Me2C6H2-6-CH2)2-{O(CH2)nCH2}]N3- (n = 1,2) have been explored. Catalytic activity for ethylene polymerization by Ti2(OiPr)2{[(O-2,4-Me2C6H2-6-CH2)2(OCH2-CH2)]N}2 (1a) - MAO catalyst increased at high temperature; the activity also increased upon addition of AlMe3. Ti(O-2,6-iPr2C6H3){[(O-2,4-Me2C6H2-6-CH2)2(OCH2CH2)]N} (1c) showed higher activity than 1a under the same conditions. Ti{[(O-2,4-Me2C6H2-6-CH2)2(HOCH2CH2CH2)]N}2 was isolated from the reaction of Ti(OiPr)4 with bis(2-hydroxy-3,5-dimethylbenzyl)-propanolamine; the structure was determined by X-ray crystallography.