Electrochemical Activation of C–C Bonds via Mediated Hydrogen Atom Transfer Reactions
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Colorado State Univ., Fort Collins, CO (United States)
- 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
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