Monocyclopentadienyl Ti complexes: Influence of pendant donors on ethylene/styrene copolymerization

INOR 165

Kyung-sun Son, kson0701@stanford.edu and Robert M. Waymouth, waymouth@stanford.edu. Department of Chemistry, Stanford University, Stanford, CA 94305
The copolymerization of ethylene and styrene with CpNTiCl3 (1) [CpN = (2-dimethylaminoethyl)cyclopentadienyl] and CpNTiCl2TEMPO (2) (TEMPO = 2,2,6,6-tetramethylpiperidine-N-oxyl) in the presence of MAO (methylaluminoxane) was carried out to evaluate the influence of the pendant amine group. The copolymers generated by 1 and 2 were compared to those produced by ordinary half-sandwich titaninum complexes such as CpTiCl3 and CpTiCl2(TEMPO), which are known to be efficient catalyst precursors for the polymerization of styrene to syndiotactic polystyrene. The copolymerization of ethylene and styrene with 1 and 2 yielded ethylene/styrene copolymers containing blocks of atactic polystyrene. To gain insights into the mechanism for the copolymerization with 1 and 2, we also investigated the influence of a radical initiator (or an inhibitor) on the monomer sequence distributions and composition of the copolymerization products.
 

Applications of Organometallic Chemistry
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007