Metal-Ligand Cooperative Approaches in Homogeneous Catalysis Using Transition Metal Complex Catalysts of Redox Noninnocent Ligands

2021 ◽  
Author(s):  
Rakesh Mondal ◽  
Amit Kumar Guin ◽  
Gargi Chakraborty ◽  
Nanda D Paul
Keyword(s):  
Transition Metal ◽  
Metal Complex ◽  
Homogeneous Catalysis ◽  
Transition Metal Complex ◽  
Raw Materials ◽  
Value Added ◽  
Catalytic Reactions ◽  
Redox Noninnocent ◽  
Metal Ligand ◽  
Metal Complex Catalysts

Catalysis offers a straightforward route to prepare various value-added molecules starting from readily available raw materials. The catalytic reactions mostly involve multi-electron transformations. Hence, compared to the inexpensive and readily...

Strategies and mechanisms of metal–ligand cooperativity in first-row transition metal complex catalysts

2020 ◽  
Vol 49 (24) ◽  
pp. 8933-8987
Author(s):  
Matthew R. Elsby ◽  
R. Tom Baker
Keyword(s):  
Transition Metal ◽  
Metal Complex ◽  
Homogeneous Catalysis ◽  
Transition Metal Complex ◽  
Bifunctional Catalysts ◽  
Metal Ligand ◽  
Metal Complex Catalysts

The use of metal–ligand cooperation (MLC) by transition metal bifunctional catalysts has emerged at the forefront of homogeneous catalysis science.

scholarly journals Recent Advances in Homogeneous Catalysis via Metal–Ligand Cooperation Involving Aromatization and Dearomatization

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 635 ◽  
Author(s):  
Takuya Shimbayashi ◽  
Ken-ichi Fujita
Keyword(s):  
Metal Complex ◽  
Homogeneous Catalysis ◽  
Catalytic Reaction ◽  
Review Article ◽  
Catalytic Reactions ◽  
Electronic Effects ◽  
Elementary Processes ◽  
Cooperative Catalysis ◽  
Metal Ligand ◽  
Metal Complex Catalysts

Recently, an increasing number of metal complex catalysts have been developed to achieve the activation or transformation of substrates based on cooperation between the metal atom and its ligands. In such “cooperative catalysis,” the ligand not only is bound to the metal, where it exerts steric and electronic effects, but also functionally varies its structure during the elementary processes of the catalytic reaction. In this review article, we focus on metal–ligand cooperation involving aromatization and dearomatization of the ligand, thus introducing the newest developments and examples of homogeneous catalytic reactions.

Polyolefin structural control using phenoxy-imine ligated group 4 transition metal complex catalysts

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Naoto Matsukawa ◽  
Sei-ichi Ishii ◽  
Rieko Furuyama ◽  
Junji Saito ◽  
Makoto Mitani ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Transition Metal ◽  
Metal Complex ◽  
Structural Control ◽  
Transition Metal Complex ◽  
Control Mechanism ◽  
Central Metal ◽  
Group 4 ◽  
Fi Catalyst ◽  
Metal Complex Catalysts

Abstract This paper describes the structural control of polyolefins achieved by using group 4 transition metal complex catalysts featuring a pair of phenoxy-imine chelate ligands (named FI catalysts). FI catalysts can produce very low to ultrahigh molecular weight polymers. For example, a Zr-FI catalyst bearing a cycloalkyl group on the imine-nitrogen with methylaluminoxane (MAO) activation is capable of selectively forming vinyl-terminated low molecular weight polyethylenes (Mw < 5000) whereas a Zr-FI catalyst with a triethylsilyl group ortho to the phenoxyoxygen can generate ethylene/propylene amorphous copolymers with ultra-high molecular weights (Mw > 10 000 000) when treated with iBu3Al / Ph3CB(C6F5)4. In addition, a Ti-FI catalyst, possessing an o-phenoxytrimethylsilyl group, with MAO can form highly syndiotactic polypropylenes ([rrrr] = 84%, Tm = 140°C) via a chainend control mechanism. Conversely, upon activation with iBu3Al / Ph3CB(C6F5)4, a Hf-FI catalyst with a tert-butyl group ortho to the phenoxy-oxygen is able to produce high molecular weight isotactic polypropylenes ([mm] = 69%, Tm = 124°C, Mw = 412 000) via a site control mechanism. Therefore, FI catalysts have shown the ability to create various polyolefin architectures by simple variation of the central metal, the ligand structure and the co-catalyst.

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