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Effect of  para ‐substituents in the ethylene (E) copolymerization with 1‐decene (DC), 1‐dodecene (DD), and with 2‐methyl‐1‐pentene (2M1P) using a series of Cp*TiCl 2 (O‐2,6‐  i  Pr 2 ‐4‐R‐C 6 H 2 ) [R=H ( 1 ),   t  Bu ( 2 ), Ph ( 3 ), CHPh 2  ( 4 ), CPh 3  ( 5 ), SiMe 3  ( 6 ), SiEt 3  ( 7 ), and newly prepared 4‐  t  BuC 6 H 4  ( 8 ) and 3,5‐Me 2 C 6 H 3  ( 9 )]‐MAO catalyst systems has been studied. The activities in these copolymerization reactions were affected by the  para ‐substituent, and the SiMe 3  ( 6 ), SiEt 3  ( 7 ) and 3,5‐Me 2 C 6 H 3  ( 9 ) analogues showed the higher activities at 50 °C in the E copolymerization reactions with DC (1.06–1.44×10 6  kg‐polymer/mol‐Ti⋅h), DD (1.04–1.88×10 6  kg‐polymer/mol‐Ti⋅h) than the others, whereas no significant differences were observed in the comonomer incorporations. Complexes  6  and  7  also showed the higher activities at 50 °C in the E/2M1P copolymerization, and the 2M1P incorporation was affected by the  para ‐substituent and the polymerization temperature; complex  9  showed better 2M1P incorporation at 25 °C.

chemistryopen

Effect of  para ‐Substituents in Ethylene Copolymerizations with 1‐Decene, 1‐Dodecene, and with 2‐Methyl‐1‐Pentene Using Phenoxide Modified Half‐Titanocenes‐MAO Catalyst Systems