Efficient Incorporation of 2-Methyl-1-pentene in Copolymerization of Ethylene with 2-Methyl-1-pentene Catalyzed by Nonbridged Half-Titanocenes

Design of Efficient Molecular Catalysts for Synthesis of Cyclic Olefin Copolymers (COC) by Copolymerization of Ethylene and α-Olefins with Norbornene or Tetracyclododecene

“…; Y = anionic ancillary donor such as aryloxy, ketimide, imidazolin-2-iminato, etc. )-that efficient catalysts for the desired copolymerization can be tuned by the ligand modification on both the cyclopentadienyl fragment and nature (and substituents) of the anionic donor ligand employed, as demonstrated in the ethylene copolymerization with NBE [22][23][24], TCD [53], cyclohexene [72], cyclopentene [73], 2-methyl-1-pentene [74], and the others [39,41,45], as summarized in Scheme 6. We thus believe that the results demonstrated here are promising in terms of the synthesis of new polymers, and provides a better understanding not only for the polymer design (combination of monomers), but also for the catalyst design for efficient synthesis.…”

“…Ethylene copolymerization with cyclic olefins by modified half-titanocene catalysts [22][23][24]39,41,45,53,[72][73][74].…”

Effect of ketimide ligand for ethylene polymerization and ethylene/norbornene copolymerization catalyzed by (cyclopentadienyl)(ketimide)titanium complexes–MAO catalyst systems: Structural analysis for Cp∗TiCl2(NCPh2)

“…185, 202, and 214°C at the NBE contents in the copolymers are 58.8, 65.8, and 73.3 mol%, respectively). Note that the activities at higher NBE/ethylene feed ratios (ethylene 2 atm, NBE 2.5-5.0 mmol/mL, runs 18 and 19) were higher than those at lower NBE/ethylene feed ratios (ethylene 4 atm, NBE 1.0 mmol/mL, runs [12][13][14], although the activity decreased upon increasing the NBE concentration (runs [18][19][20]. The observed facts are unique contrast to those in the copolymerization using ordinary metallocenes or linked halftitanocenes.…”

“…1 H NMR (CDCl 3 ): d 6.65 (s, 5H, Cp), 7.43 (t, 4H, meta), 7.52 (t, 2H, para), 7.60 (d, 4H, ortho). 13 (1), Cp * (2); R 1 ,R 2 = t Bu, t Bu (a), t Bu,Ph (b), Ph,Ph (c) All measurements were performed on a Rigaku RAXIS-RAPID Imaging Plate diffractometer with graphite monochromated Mo Ka radiation. The selected crystal collection parameters are listed in Table 5, and the detailed results were described in the reports attached below.…”

“…In particular, nonbridged half-titanocenes (titanium halfsandwich complexes) containing an aryloxo ligand of the type, Cp 0 TiðOArÞX 2 (Ar = 2,6-i Pr 2 C 6 H 3 , etc. ), displayed the promising characteristics [4,[7][8][9][10][11][12][13][14]. For example, efficient catalyst precursors especially for copolymerization of ethylene with a-olefin [9], styrene [10], norbornene [11], cyclohexene [12], 2-methyl-1-pentene [13], vinylcyclohexane [14] can be tuned by modification of Cp 0 .…”