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Electrochemical Activation of C–C Bonds via Mediated Hydrogen Atom Transfer Reactions

Journal Article · · ChemSusChem
 [1];  [2];  [3];  [2];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Colorado State Univ., Fort Collins, CO (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Activating inert sp 3 -sp 3 carbon-carbon (C-C) bonds remains a major bottleneck in the chemical upcycling of recalcitrant polyolefin waste. Here, we use redox mediators to activate the inert C-C bonds. Specifically, we use N -hydroxyphthalimide (NHPI) as the redox mediator that is oxidized to phthalimide- N -oxyl (PINO) radical to initiate hydrogen atom transfer (HAT) reactions with benzylic C-H bonds. The resulting carbon radical is readily captured by molecular oxygen to form a peroxide that decomposes into oxygenated C-C bond-scission fragments. This indirect approach reduces the oxidation potential by > 1.2 V compared to the direct oxidation of the substrate. Studies with model compounds revealed the selectivity of C-C bond cleavage increases with decreasing C-C bond dissociation energy. With NHPI-mediated oxidation, oligomeric styrene ( M n = 510 Da, OS 510 ) and polystyrene (PS, ~10,000 Da) were converted into oxygenated monomers, dimers, and oligomers.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
BioOptimized Technologies to keep Thermoplastics out of Landfills and the Environment (BOTTLE) Consortium; USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1839920
Alternate ID(s):
OSTI ID: 1846318
Report Number(s):
NREL/JA-2A00-81783; MainId:82556; UUID:73409701-9bd6-4057-903e-123288b98b2e; MainAdminID:63586
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Journal Issue: 6 Vol. 15; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

References (61)

Metallinsertion in C-C-Bindungen in Lösung journal April 1999
Metal Insertion into C−C Bonds in Solution journal April 1999
Elements of Molecular and Biomolecular Electrochemistry book January 2006
Upcycling to Sustainably Reuse Plastics journal July 2021
Die nächste Generation des Recyclings – neues Leben für Kunststoffmüll journal June 2020
Beyond Mechanical Recycling: Giving New Life to Plastic Waste journal June 2020
Unstrained CarbonCarbon Bond Cleavage journal September 2014
Mechanistic Study of the Electrocatalytic Oxidation of Alcohols by TEMPO and NHPI journal July 2013
Thermal decomposition of flame-retarded high-impact polystyrene journal August 2003
Valuable oxygenates by aerobic oxidation of polymers using metal/bromide homogeneous catalysts journal June 2003
Electrocatalytic oxidative cleavage by electrogenerated periodate journal March 2003
Oxidative aliphatic carbon–carbon bond cleavage reactions journal November 2013
Catalytic processing of plastic waste on the rise journal June 2021
Catalytic carbon-carbon bond cleavage and carbon-element bond formation give new life for polyolefins as biodegradable surfactants journal May 2021
Electrochemical cleavage of 1,2-diphenylethanes at boron-doped diamond electrodes journal June 2004
Polyolefins with controlled environmental degradability journal July 2006
Electrochemical Oxidation of Organic Molecules at Lower Overpotential: Accessing Broader Functional Group Compatibility with Electron−Proton Transfer Mediators journal February 2020
Electrochemical Oxidation Induced Selective C–C Bond Cleavage journal October 2020
Tetramethylpiperidine N -Oxyl (TEMPO), Phthalimide N -Oxyl (PINO), and Related N -Oxyl Species: Electrochemical Properties and Their Use in Electrocatalytic Reactions journal April 2018
Foamed Polystyrene in the Marine Environment: Sources, Additives, Transport, Behavior, and Impacts journal August 2020
Kinetics of N -oxyl Radicals’ Decay journal May 2020
N -Hydroxyphthalimide: A Hydrogen Atom Transfer Mediator in Hydrocarbon Oxidations Promoted by Nonheme Iron(IV)–Oxo Complexes journal September 2019
Electrochemically Oxidative C–C Bond Cleavage of Alkylarenes for Anilines Synthesis journal January 2019
Upcycling Single-Use Polyethylene into High-Quality Liquid Products journal September 2019
Tandem Heterogeneous Catalysis for Polyethylene Depolymerization via an Olefin-Intermediate Process journal January 2021
Hydrogenolysis of Polypropylene and Mixed Polyolefin Plastic Waste over Ru/C to Produce Liquid Alkanes journal July 2021
Microwave-Assisted Catalytic Cleavage of C–C Bond in Lignin Models by Bifunctional Pt/CDC-SiC journal December 2019
The Catalytic Valorization of Lignin for the Production of Renewable Chemicals journal June 2010
Developing Advanced Catalysts for the Conversion of Polyolefinic Waste Plastics into Fuels and Chemicals journal August 2012
Diffusion in Polymer Solutions journal August 1968
Palladium-Catalyzed Arylative Carbon−Carbon Bond Cleavage of α,α-Disubstituted Arylmethanols journal October 2001
Biomimetic Catalytic System Driven by Electron Transfer for Selective Oxygenation of Hydrocarbon journal August 2004
Mechanism of Electrochemical Generation and Decomposition of Phthalimide- N -oxyl journal July 2021
Scalable, Electrochemical Oxidation of Unactivated C–H Bonds journal May 2017
N -Hydroxyphthalimide-Mediated Electrochemical Iodination of Methylarenes and Comparison to Electron-Transfer-Initiated C–H Functionalization journal December 2017
Electrochemical Aminoxyl-Mediated Oxidation of Primary Alcohols in Lignin to Carboxylic Acids: Polymer Modification and Depolymerization journal September 2019
Conversion of Polyolefin Waste to Liquid Alkanes with Ru-Based Catalysts under Mild Conditions journal December 2020
Carbon-hydrogen vs. carbon-carbon bond cleavage of 1,2-diarylethane radical cations in acetonitrile-water journal May 1984
Hydroxylamines as Oxidation Catalysts:  Thermochemical and Kinetic Studies journal March 2003
Kinetic Study of the Phthalimide N -Oxyl (PINO) Radical in Acetic Acid. Hydrogen Abstraction from C−H Bonds and Evaluation of O−H Bond Dissociation Energy of N -Hydroxyphthalimide journal May 2003
Self-Diffusion and Viscosity of Low Molecular Weight Polystyrene over a Wide Temperature Range journal February 2004
Scalable and sustainable electrochemical allylic C–H oxidation journal April 2016
Selective sp3 C–H alkylation via polarity-match-based cross-coupling journal June 2017
U1 snRNP regulates cancer cell migration and invasion in vitro journal January 2020
Chemical recycling of waste plastics for new materials production journal June 2017
Quantum chemical calculations for over 200,000 organic radical species and 40,000 associated closed-shell molecules journal July 2020
A comprehensive metabolic map for production of bio-based chemicals journal January 2019
Chemical and biological catalysis for plastics recycling and upcycling journal July 2021
Transition metal-catalyzed carbon–carbon bond activation journal January 2004
Cleavage of carbon–carbon bonds by radical reactions journal January 2019
PINO/NHPI-mediated selective oxidation of cycloalkenes to cycloalkenones via a photo-electrochemical method journal January 2019
The radical rate-determining step in the oxidation of benzyl alcohols by two N–OH-type mediators of laccase: the polar N-oxyl radical intermediate journal January 2002
Redox catalysis in organic electrosynthesis: basic principles and recent developments journal January 2014
Collective and thermal diffusion in dilute, semidilute, and concentrated solutions of polystyrene in toluene journal December 2003
Lignin valorization through integrated biological funneling and chemical catalysis journal August 2014
Phthalimide‐ N ‐oxyl (PINO) Radical, a Powerful Catalytic Agent: Its Generation and Versatility Towards Various Organic Substrates journal April 2009
Electron-deficient N-oxyl radicals – new reagents for selective oxidative functionalization of organic substrates journal June 2021
Polyethylene upcycling to long-chain alkylaromatics by tandem hydrogenolysis/aromatization journal October 2020
Photodegradation and photostabilization of polymers, especially polystyrene: review journal August 2013
Ruthenium-catalyzed Reconstructive Synthesis of Functional Organic Molecules via Cleavage of Carbon–Carbon Bonds journal November 2005
Oxime radicals: generation, properties and application in organic synthesis journal January 2020