Preparation and activity of ruthenium catalyst based on β-cyclodextrin for ring-opening metathesis polymerization

Yoshida, Daichi; Sinawang, Garry; Osaki, Motofumi; Yamaguchi, Hiroyasu; Harada, Akira; Takashima, Yoshinori

doi:10.1016/j.tetlet.2020.152712

Cited by 6 publications

(4 citation statements)

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“…After the reaction, a new monomer is bound and the process repeats itself as the ruthenium cyclodextrin catalyst remains attached to the end of the polymer chain, providing processivity to the overall process (Figure 5). [12b] …”

Section: Synthetic Processive Catalystsmentioning

confidence: 99%

Artificial Processive Catalytic Systems

Nolte,

Elemans

2024

Chemistry A European J

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Processive catalysts remain attached to a substrate and perform multiple rounds of catalysis. They are abundant in nature. This review highlights artificial processive catalytic systems, which can be divided into (A) catalytic rings that move along a polymer chain, (B) catalytic pores that hold polymer chains and decompose them, (C) catalysts that remain attached to and move around a cyclic substrate via supramolecular interactions, and (D) anchored catalysts that remain in contact with a substrate via multiple catalytic interactions (see frontispiece).

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Section: Synthetic Processive Catalystsmentioning

confidence: 99%

Artificial Processive Catalytic Systems

Nolte,

Elemans

2024

Chemistry A European J

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“…36 The polymer was prepared by ring-opening metathesis polymerization (ROMP), using Grubbs second-generation catalyst (Figure 1). 39 This material is a soft white solid (T m = 59.3 °C, DSC), soluble at about 120 °C in benzene, toluene, or xylene.…”

Section: Preparation Of Polymer Samples For Measurementsmentioning

confidence: 99%

Hydrocarboxylation of C═C Bonds in Polycyclooctene: Progress Toward Valorization of Waste Polyolefins

Ogbu,

Fastow,

Zhu

et al. 2024

Macromolecules

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Upcycling of waste polyolefins into higher-value functional polymers through chemical functionalization is a promising strategy to recover value and minimize their environmental impact. We report the hydrocarboxylation of polycyclooctene as a model for accessing ethylene acrylic acid copolymers (EAA) from waste polyethylene. The effects of various process parameters on the hydrocarboxylation were investigated. The relationship between carboxylic acid concentration and material properties, including crystallinity, melting temperature, glass transition temperature, adhesive properties, and wettability, was studied in comparison to an unfunctionalized polyethylene. Among the catalysts evaluated, Co 2 (CO) 8 exhibited relatively slow kinetics toward the hydrocarboxylation and was not compatible with 2,6-ditert-butyl hydroxytoluene, a common additive present in commercial polyolefins. PdCl 2 (PPh 3 ) 2 exhibited a higher reactivity toward the hydrocarboxylation, though polymer gelation was observed with extended reaction times or high catalyst loadings. Carboxylic acid incorporation into the polymer was readily controlled by varying the reaction time. Overall, the resultant COOH-functionalized polyolefins possessed properties analogous to commercial EAA.

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“…Recently, HG2 generation catalysts were immobilized in the cavity of β-cyclodextrin using a guest–host approach for aqueous ROMP reactions. 10 Patel et al encapsulated Grubbs 2nd generation (G2) catalysts in a calcium alginate gel matrix for ring-closing metathesis reactions (RCM) in aqueous media. 11 However, in the RCM reactions with bare G2/alginate catalysts in water, the covalent modifications of the alginate gel structure with an octyl group are necessary to improve the reaction rate of metathesis reactions due to the limited diffusion of hydrophobic substrates.…”

Section: Introductionmentioning

confidence: 99%