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- W2028545209 abstract "Five different titanium compounds cis- [Ti(η 2 -hbo) 2 (OEt) 2 ]·0.5toluene ( 1 ), cis -[TiCl 2 (η 2 -thp) 2 ] ( 2 ), [TiCl 2 (edbp) 2 ] ( 3 ), [Ti 2 (μ-OMe) 2 (edbp) 2 (Me) 2 ] ( 6) , [Ti 2 (μ-OMe) 2 (edbp) 2 (OMe) 2 ] ( 7 ) (Hhbo = 2-(2-hydroxyfenyl)benzoxazole, Hthp = tetrahydropyran-2-methanol, H 2 edbp = 2,2'-ethylidenebis(4,6-di- tert -butylphenol)), have been prepared and tested in combination with MAO as catalysts for propene polymerization and ethene and oct-1-ene copolymerization with the aim of gaining insight into the structure of the active species. Investigation of the 1 /AlMe 3 or 2 /AlMe 3 systems resulted in isolation of [Al(η 2 -hbo) 2 (Me)] ( 4 ) and [Al 2 (μ 2 -η 2 -thp) 2 (Me) 4 ] ( 5 ) in high yields. This indicates that the trimethylaluminum contained in MAO abstracts ligands from 1 or 2 , affecting thus the catalytic performance of the 1 , 2 /MAO catalysts. In contrast, compound 3 reacted with MAO affording methylated product 6 . Accordingly, the 3 /MAO catalyst differed from the above ones, furnishing at 70 °C e.g., narrow molecular weight polypropylene ( M n = 454 000; M w /M n = 2.49; T m = 158.2 °C)." @default.
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- W2028545209 date "2007-01-01" @default.
- W2028545209 modified "2023-10-16" @default.
- W2028545209 title "Ligand Migration in the Reaction of Titanium Complexes with AlMe3" @default.
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- W2028545209 doi "https://doi.org/10.1135/cccc20070541" @default.
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