Synergistic Dual Transition Metal Catalysis

Kim, U. Bin; Jung, Da Jung; Jeon, Hyun Ji; Rathwell, Kris; Lee, Sang Gi

doi:10.1021/acs.chemrev.0c00245

Cited by 243 publications

(118 citation statements)

References 262 publications

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“…The temperature inside the reactor was controlled by an oil bath heating circulator (IKA CBC5-Control) connected to the reactor's jacket. Previous work investigated different molecular weights for PLA methanolysis and concluded that the rate of degradation is Over the past two decades, the use of dual catalyst systems consisting of transition metal complexes alongside an organocatalyst has received increasing attention [38][39][40]. Careful selection of synergistic catalysts can cause unprecedented reactivities, which would not be accessible using either catalyst alone.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…Since reactions proceeded faster and with higher selectivity for the product when both catalysts were employed together instead of either alone, it suggests that there is a synergistic effect between the two catalysts for PLA alcoholysis. Over the past two decades, the use of dual catalyst systems consisting of transition metal complexes alongside an organocatalyst has received increasing attention [38][39][40]. Careful selection of synergistic catalysts can cause unprecedented reactivities, which would not be accessible using either catalyst alone.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Dual Catalytic System and Kinetics for the Alcoholysis of Poly(Lactic Acid)

2021

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Plastic pollution is a global issue that is approaching crisis levels as plastic production is projected to reach 1.1 GT annually by 2050. The bioplastic industry along with a circular production economy are solutions to this problem. One promising bioplastic polylactic acid (PLA) has mechanical properties comparable to polystyrene (PS), so it could replace PS in its applications as a more environmentally sustainable material. However, since the bioplastic PLA also suffers from long biodegradation times in the environment, to ensure that it does not add to the current pollution problem, it should instead be chemically recycled. In this work, PLA was chemically recycled via alcoholysis, using either methanol or ethanol to generate the value-added products methyl lactate and ethyl lactate respectively. Two catalysts, zinc acetate dihydrate (ZnAc) and 4-(dimethylamino)pyridine (DMAP), were tested both individually and in mixtures. A synergistic effect was exhibited on the reaction rate when both catalysts were used in an equal ratio. The methanolysis reaction was determined to be two-step, with the activation energy estimated to be 73 kJ mol−1 for the first step and 40.16 kJ mol−1 for the second step. Both catalysts are cheap and commercially available, their synergistic effect could be exploited for large-scale PLA recycling.

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Section: Apparatus and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synergistic Dual Catalytic System and Kinetics for the Alcoholysis of Poly(Lactic Acid)

2021

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“…Transition metals have been used to catalyze several organic reactions as they provide large surface area and they have vacant d-orbitals due to which they can show variable oxidation state that help in generation of intermediate for organic synthesis [29][30]. The common process for the click reaction is the transition metal catalyzed synthesis of 1,2,3-triazoles.…”

Section: Metal-catalyzed Synthesis Of Triazole Derivativesmentioning

confidence: 99%

Role of Click Chemistry in Organic Synthesis

Sethiya¹,

Sahiba²,

Agarwal³

2021

Current Topics in Chirality - From Chemistry to Biology

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Click chemistry involves highly efficient organic reactions of two or more highly functionalized chemical entities under eco-benign conditions for the synthesis of different heterocycles. Several organic reactions such as nucleophilic ring-opening reactions, cyclo-additions, nucleophilic addition reactions, thiol-ene reactions, Diels Alder reactions, etc. are included in click reactions. These reactions have very important features i.e. high functional group tolerance, formation of a single product, high atom economy, high yielding, no need for column purification, etc. It also possesses several applications in drug discovery, supramolecular chemistry, material science, nanotechnology, etc. Being highly significant and valuable, we have elaborated on several aspects of click reactions in organic synthesis in this chapter. Recent advancements in the field of organic synthesis using click chemistry approach have been deliberated by citing last five years articles.

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“…The simultaneous activation of two coupling partners with two independent catalysts is known as synergistic catalysis. 23 This strategy has become a useful tool for the synthesis of complex molecular architectures, 24 and it has been especially useful in transition-metal catalyzed allylations. When each co-catalyst is chiral, synergistic catalysis can provide divergent control over the relative stereochemistry of two generated vicinal stereocenters.…”

Section: Synergistic Dual Catalysismentioning

confidence: 99%

Towards α,α-disubstituted amino acids containing vicinal stereocenters via stereoselective transition-metal catalyzed allylation

Chung¹,

Parker²,

Dong³

2021

Arkivoc

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Designer amino acids find use across many scientific disciplines. The preparation of amino acids bearing acyclic vicinal stereocenters remains a challenge in synthesis. Herein, we highlight transition-metal catalyzed allylations for the stereoselective synthesis of disubstituted α-amino acid precursors bearing vicinal stereocenters. Allylation of azlactones, α-imino esters, and aldimine esters with dienes and allylic leaving groups are among the most common strategies. These developments provide context for our work featuring the asymmetric addition of α-nitroesters to alkynes.

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Synergistic Dual Transition Metal Catalysis

Cited by 243 publications

References 262 publications

Synergistic Dual Catalytic System and Kinetics for the Alcoholysis of Poly(Lactic Acid)

Synergistic Dual Catalytic System and Kinetics for the Alcoholysis of Poly(Lactic Acid)

Role of Click Chemistry in Organic Synthesis

Towards α,α-disubstituted amino acids containing vicinal stereocenters via stereoselective transition-metal catalyzed allylation

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