Polymerization of 1,3-butadiene catalyzed by ion-pair cobalt complexes with (benzimidazolyl)pyridine alcohol ligands

Ai, Pengfei; Chen, Lin; Jie, Suyun; Li, Bo‐Geng

doi:10.1016/j.molcata.2013.09.007

Cited by 17 publications

(4 citation statements)

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“…Highly cis -1,4-polybutadienes (∼95%) were obtained with catalysts based on bidentate phosphine Co complexes (CoCl 2 [R 2 P(CH 2 ) n PR 2 ]–MAO; R = Me, Et, Ph; n = 1, 2), independently of the type of bidentate phosphine ligand bonded to the cobalt atom. ,, Predominantly cis -1,4-polybutadienes were also recently obtained with several new catalytic systems based on cobalt complexes with bi- and tridentate ligands containing N and/or O as donor atoms (e.g., bis-imines, bis-imino-pyridines, keto-imines, and keto-pyridinimines), regardless of the nature of the ligand coordinated to the cobalt atom. ,,,,− …”

Section: Catalysts Based On Transition Metal and Lanthanide Complexes...mentioning

confidence: 98%

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Dienes Polymerization: Where We Are and What Lies Ahead

Ricci¹,

Pampaloni

Sommazzi

et al. 2021

Macromolecules

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Recently, the research activity in the field of the stereospecific polymerization of conjugated dienes has focused on the use of catalysts based on organometallic complexes having a well-defined structure and containing ligands of various types (e.g., phosphines, bis-imines, and pyridylimines), since it has been observed that the nature of the ligand, as expected on the basis of the diene polymerization mechanism proposed several years ago by Porri, is able to exert a strong influence on the polymerization regioand stereoselectivity, on the polymer molecular weights and their distribution, and in some cases to impart a living feature to the catalysts themselves. In this Perspective we highlight the most recent results obtained in this field and discuss possible future developments in this area.

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Section: Catalysts Based On Transition Metal and Lanthanide Complexes...mentioning

confidence: 98%

“…A series of ion-pair cobalt complexes supported by (benzimidazolyl)pyridine alcohol ligands ([N ∧ N ∧ O]) were synthesized by Jie et al and used in combination with EASC to obtain cis -1,4-polybutadiene with high cis selectivity (>95%) …”

Section: Catalysts Based On Transition Metal and Lanthanide Complexes...mentioning

confidence: 99%

Dienes Polymerization: Where We Are and What Lies Ahead

Ricci¹,

Pampaloni

Sommazzi

et al. 2021

Macromolecules

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“…Ai et al [ 45 ] synthesized a series of ion-pair cobalt complexes 41 – 46 supported by benzimidazolyl-pyridinyl alcoholato ligands and tested them in the polymerization of 1,3-butadiene (BD). The polymerization of BD by a pyridinyl alcoholato ligand supported cobalt catalyst resulted in cis -1,4-polybutadiene with high selectivity (>95%) under Al/catalyst molar ration of 50:1 at 30 °C upon activation with the cocatalyst EASC.…”

Section: Synthesis and Application Of Transition Metal Complexes Omentioning

confidence: 99%

Synthesis and Application of the Transition Metal Complexes of α-Pyridinyl Alcohols, α-Bipyridinyl Alcohols, α,α’-Pyridinyl Diols and α,α’-Bipyridinyl Diols in Homogeneous Catalysis

2018

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The paper presents a comprehensive survey on the synthetic procedures of transition metal complexes of α-pyridinyl alcoholato, α-bipyridinyl alcoholato, α,α’-pyridinyl dialcoholato and α,α’-bipyridinyl dialcoholato ligands and their coordination chemistry. Greater emphasis is, however, given to the catalytic activity of the complexes in homogeneous and asymmetric chemical reactions. The multidentate character of the pyridinyl alcohols and/or bipyridinyl diols is of great importance in the complexation with a large number and type of transition metals. The transition metal complexes of pyridinyl alcoholato or bipyridinyl dialcoholato ligands in most cases, and a few pyridinyl alcohols alone, were used as catalysts in homogeneous and chemical asymmetric reactions. In most of the homogeneously catalysed enantioselective chemical reactions, limited numbers and types of pyridinyl alcohols and or bipyridinyl diols were used in the preparation of chiral catalysts that led to a few investigations on the catalytic importance of the pyridinyl alcohols.

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“…In (co)polymerization of conjugated dienes, a cobalt-based system has unambiguously shown distinguished performances and received the earliest recognition in the academic and commercial production of cis -1,4 and 1,2-polybutadiene due to facile availability, high air and thermal stability of compound. Particularly, the versatility as well as tunable regio and stereoselectivity in polymerization of some substituted butadienes; − for example, the unique 1,2 stereospecificity toward butadiene ,,,,, as well as 3-methyl-1,3-pentadiene, affording semicrystalline to crystalline materials whose properties can be tuned by the catalyst formula as well as polymerization procedures . Nevertheless, cobalt has been less known for catalytic polymerization of isoprene and myrcene, ,, and the reason why subtle monomer difference causes large differences in reactivity and selectivity has not yet been explored.…”

Section: Introductionmentioning

confidence: 99%

Capability of PN³-type Cobalt Complexes toward Selective (Co-)Polymerization of Myrcene, Butadiene, and Isoprene: Access to Biosourced Polymers

Zhao

Zhang

et al. 2019

Ind. Eng. Chem. Res.

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In this manuscript, cobalt complexes Co1, Co2, and Co3 supported by PN3-type of ligand have been prepared, characterized, and applied in polymerization of myrcene (My), butadiene (Bd), and isoprene (Ip). The type of catalyst, cocatalyst, and temperature variation have little influence on polymer microstructure. We also have reported the preparation of novel isoprene–myrcene copolymers in the presence of complex Co1. Isoprene and myrcene are found to be randomly copolymerized at various monomer feeding, with typical myrcene incorporation of 7.6–57.6%. The copolymer has cis-1,4 microstructure of 69.4–73.4% and 79.4–83.4% for polyisoprene and polymyrcene segments, respectively, and T g = ca. −41.7 to 51.1 °C. The reactivity ratios obtained from the Fineman–Ross plot of r 1 = 0.74 and r 2 = 1.67 (r 1 = k mymy/k myip and r 2 = k ipip/k ipmy) indicate that isoprene has the privilege of getting into the macromolecules during the polymerization by this catalyst system.

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Polymerization of 1,3-butadiene catalyzed by ion-pair cobalt complexes with (benzimidazolyl)pyridine alcohol ligands

Cited by 17 publications

References 47 publications

Dienes Polymerization: Where We Are and What Lies Ahead

Dienes Polymerization: Where We Are and What Lies Ahead

Synthesis and Application of the Transition Metal Complexes of α-Pyridinyl Alcohols, α-Bipyridinyl Alcohols, α,α’-Pyridinyl Diols and α,α’-Bipyridinyl Diols in Homogeneous Catalysis

Capability of PN³-type Cobalt Complexes toward Selective (Co-)Polymerization of Myrcene, Butadiene, and Isoprene: Access to Biosourced Polymers

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Polymerization of 1,3-butadiene catalyzed by ion-pair cobalt complexes with (benzimidazolyl)pyridine alcohol ligands

Cited by 17 publications

References 47 publications

Dienes Polymerization: Where We Are and What Lies Ahead

Dienes Polymerization: Where We Are and What Lies Ahead

Synthesis and Application of the Transition Metal Complexes of α-Pyridinyl Alcohols, α-Bipyridinyl Alcohols, α,α’-Pyridinyl Diols and α,α’-Bipyridinyl Diols in Homogeneous Catalysis

Capability of PN3-type Cobalt Complexes toward Selective (Co-)Polymerization of Myrcene, Butadiene, and Isoprene: Access to Biosourced Polymers

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Product

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Capability of PN³-type Cobalt Complexes toward Selective (Co-)Polymerization of Myrcene, Butadiene, and Isoprene: Access to Biosourced Polymers