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An Efficient Titanium Amidinate Catalyzed Version of Ziegler's “Aufbaureaktion”
Author(s) -
Obenauf Johannes,
Kretschmer Winfried P.,
Bauer Tobias,
Kempe Rhett
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201194
Subject(s) - methylaluminoxane , chemistry , titanium , polymerization , catalysis , aluminium , ethylene , polymer chemistry , polyethylene , chain transfer , ammonium , medicinal chemistry , organic chemistry , metallocene , polymer , radical polymerization
Diethylamidotitanium trichloride reacts with a variety of bulky amidines ArN(H)C(Ar′)NAr [Ar = 2,6‐diisopropylphenyl; Ar′ = Ph, p ‐Me 2 NC 6 H 4 , p ‐MeOC 6 H 4 , p ‐(2,5‐dimethylpyrrole)C 6 H 4 ] to form ammonium titanates. These new titanium complexes undergo polyethylenyl chain transfer polymerization to aluminium alkyls after activation with d‐MAO (“dry methylaluminoxane”). Ethylene is polymerized with an activity of up to 1000 kg PE mol cat –1 h –1 bar –1 in the presence of 1000 equiv. of triethylaluminium. Linear aluminium‐terminated polyethylene is the only product observed. This polymerization process can be viewed as an efficient catalytic version of Ziegler's “Aufbaureaktion”.