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Nomura, Kotohiro,Fukuda, Hiroya,Katao, Shohei,Fujiki, Michiya,Kim, Hyun Joon,Kim, Dong-Hyun,Zhang, Shu Royal Society of Chemistry 2011 Dalton transactions Vol.40 No.31
<P>Various half-sandwich titanium complexes containing iminoimidazolidide ligands, CpTiCl<SUB>2</SUB>[1,3-R<SUB>2</SUB>(CH<SUB>2</SUB>N)<SUB>2</SUB>C?N] (1a–d) [R = Ph (a), 2,6-Me<SUB>2</SUB>C<SUB>6</SUB>H<SUB>3</SUB> (b), cyclohexyl (c), <SUP><I>t</I></SUP>Bu (d)], have been employed as the catalyst precursors for ethylene polymerisation, syndiospecific styrene polymerisation, and copolymerisation of ethylene with 1-hexene in the presence of MAO cocatalyst; 1d showed the highest catalytic activity for ethylene polymerisation whereas 1b showed the highest activity for syndiospecific styrene polymerisation.</P> <P>Graphic Abstract</P><P>Effect of ligand substituents in ethylene polymerisation, syndiospecific styrene polymerisation, and ethylene/1-hexene copolymerisation using half-sandwich titanium complexes containing iminoimidazolidide ligands–MAO catalysts have been explored. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1dt10467e'> </P>