Highly Syndiospecific Living Polymerization of Propylene Using a Titanium Complex Having Two Phenoxy-Imine Chelate Ligands

2001 ◽  
Vol 30 (6) ◽  
pp. 576-577 ◽  
Author(s):  
Junji Saito ◽  
Makoto Mitani ◽  
Jun-ichi Mohri ◽  
Sei-ichi Ishii ◽  
Yasunori Yoshida ◽  
...  
Keyword(s):  
Living Polymerization ◽  
Titanium Complex ◽  
Chelate Ligands

Living Polymerization of Ethylene with a Titanium Complex Containing Two Phenoxy-Imine Chelate Ligands

2001 ◽  
Vol 113 (15) ◽  
pp. 3002-3004 ◽  
Author(s):  
Junji Saito ◽  
Makoto Mitani ◽  
Jun-ichi Mohri ◽  
Yasunori Yoshida ◽  
Shigekazu Matsui ◽  
...  
Keyword(s):  
Living Polymerization ◽  
Titanium Complex ◽  
Chelate Ligands

Living Polymerization of Ethylene with a Titanium Complex Containing Two Phenoxy-Imine Chelate Ligands

2001 ◽  
Vol 40 (15) ◽  
pp. 2918-2920 ◽  
Author(s):  
Junji Saito ◽  
Makoto Mitani ◽  
Jun-ichi Mohri ◽  
Yasunori Yoshida ◽  
Shigekazu Matsui ◽  
...  
Keyword(s):  
Living Polymerization ◽  
Titanium Complex ◽  
Chelate Ligands

Living syndiospecific polymerization of propylene with sterically encumbered titanium complexes activated by MMAO

2014 ◽  
Vol 5 (22) ◽  
pp. 6510-6522 ◽  
Author(s):  
Ying-Yun Long ◽  
Yong-Xia Wang ◽  
Bai-Xiang Li ◽  
Yan-Guo Li ◽  
Yue-Sheng Li
Keyword(s):  
Molecular Weight ◽  
Living Polymerization ◽  
Bulky Substituent ◽  
Titanium Complexes ◽  
Titanium Complex ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions

On activation with MMAO, the newly designed titanium complex with bulky substituent promotes living polymerization of propylene, affording highly syndiotactic (rrrr 98.0%) polymers with high molecular weights and narrow molecular weight distributions (Mw/Mn ≤ 1.26).

New Monodisperse Ethylene–Propylene Copolymers and a Block Copolymer Created by a Titanium Complex Having Fluorine-Containing Phenoxy-Imine Chelate Ligands

2001 ◽  
Vol 30 (8) ◽  
pp. 822-823 ◽  
Author(s):  
Shin-ichi Kojoh ◽  
Tomoaki Matsugi ◽  
Junji Saito ◽  
Makoto Mitani ◽  
Terunori Fujita ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Titanium Complex ◽  
Ethylene Propylene ◽  
Chelate Ligands

A New Titanium Complex Having Two Phenoxy-Imine Chelate Ligands for Ethylene Polymerization

2002 ◽  
Vol 203 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Junji Saito ◽  
Makoto Mitani ◽  
Shigekazu Matsui ◽  
Yasushi Tohi ◽  
Haruyuki Makio ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Titanium Complex ◽  
Chelate Ligands

Living Polymerization of Ethylene Catalyzed by Titanium Complexes Having Fluorine-Containing Phenoxy−Imine Chelate Ligands

2002 ◽  
Vol 124 (13) ◽  
pp. 3327-3336 ◽  
Author(s):  
Makoto Mitani ◽  
Jun-ichi Mohri ◽  
Yasunori Yoshida ◽  
Junji Saito ◽  
Seiichi Ishii ◽  
...  
Keyword(s):  
Living Polymerization ◽  
Titanium Complexes ◽  
Chelate Ligands

Reversible Oxidative-Addition and Reductive-Elimination of Thiophene from a Titanium Complex and Its Thermally-Induced Hydrodesulfurization Chemistry

2019 ◽  
Author(s):  
Alejandra Gomez-Torres ◽  
J. Rolando Aguilar-Calderón ◽  
Carlos Saucedo ◽  
Aldo Jordan ◽  
Alejandro J. Metta-Magaña ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Ring Opening ◽  
Thiophene Ring ◽  
Oxidative Addition ◽  
Reductive Elimination ◽  
Thermally Induced ◽  
Titanium Complex

<p>The masked Ti(II) synthon (<sup>Ket</sup>guan)(<i>η</i><sup>6</sup>-Im<sup>Dipp</sup>N)Ti (<b>1</b>) oxidatively adds across thiophene to give ring-opened (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti[<i>κ</i><sup>2</sup>-<i>S</i>(CH)<sub>3</sub><i>C</i>H] (<b>2</b>). Complex <b>2</b> is photosensitive, and upon exposure to light, reductively eliminates thiophene to regenerate <b>1</b> – a rare example of early-metal mediated oxidative-addition/reductive-elimination chemistry. DFT calculations indicate strong titanium π-backdonation to the thiophene π*-orbitals leads to the observed thiophene ring opening across titanium, while a proposed photoinduced LMCT promotes the reverse thiophene elimination from <b>2</b>. Finally, pressurizing solutions of <b>2 </b>with H<sub>2</sub> (150 psi) at 80 °C leads to the hydrodesulfurization of thiophene to give the Ti(IV) sulfide (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti(S) (<b>3</b>) and butane. </p>

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