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Title: Improving Carbonate-Promoted C–H Carboxylation Using Mesoporous Carbon Supports

Journal Article · · ACS Sustainable Chemistry & Engineering

C–H carboxylation is an attractive way to utilize CO2 for chemical production provided that it does not consume resource-intensive reagents. Alkali carbonates dispersed into the pores of mesoporous supports display strongly basic reactivity under CO2, allowing them to be used as base promoters for C–H carboxylation of (hetero)arenes in the absence of other reagents or catalysts. Mesoporous oxides are convenient support materials, but only a relatively small fraction of the dispersed carbonate (ca. 10-20%) is converted to carboxylate products when metal oxide supports are used. Here we compare mesoporous oxide and carbon supports and investigate the dependence of carbonate reactivity on pore structure. We show that using mesoporous carbons supports can increase the carbonate conversion by 2–4x when compared to oxide supports. This improved carbonate reactivity is maintained across a variety of mesoporous carbons with different pore structures (ordered vs. disordered) and pore diameters, indicating that the dispersed carbonate is intrinsically more reactive on the surface of a carbon material compared to an oxide surface. Reaction of the carboxylate products with dimethyl carbonate yields isolable methyl esters as the final product and regenerates the dispersed carbonate. We show that mesoporous carbon supports are robust to at least 5 cycles of successive C–H carboxylation and methylation with dimethyl carbonate. Furthermore, understanding how the support structure affects dispersed carbonate reactivity is valuable for advancing C–H carboxylation toward practical application and utilizing these materials in other CO2 transformations.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020394
OSTI ID:
1972326
Journal Information:
ACS Sustainable Chemistry & Engineering, Vol. 11, Issue 15; ISSN 2168-0485
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (38)

A closed cycle for esterifying aromatic hydrocarbons with CO2 and alcohol journal August 2019
Acrylic Acid and Derivatives book January 2020
Recent progress and challenges in carboxylation with CO2 journal December 2021
Formal C−H Carboxylation of Unactivated Arenes journal May 2020
Direct Carboxylation of Electron‐Rich Heteroarenes Promoted by LiO‐ t Bu with CsF and [18]Crown‐6 journal February 2019
The road to industrialization of fine chemical carboxylation reactions journal November 2021
Phase Behavior That Enables Solvent-Free Carbonate-Promoted Furoate Carboxylation journal August 2020
C−H Carboxylation of Aromatic Compounds through CO 2 Fixation journal August 2017
Double-Carboxylation of Two C–H Bonds in 2-Alkylheteroarenes Using LiO-t-Bu/CsF journal May 2019
Lewis Acid-Mediated Carboxylation of Fused Aromatic Compounds with Carbon Dioxide journal January 2002
Adsorptive removal of resorcinol on a novel ordered mesoporous carbon (OMC) employing COK-19 silica scaffold: Kinetics and equilibrium study journal January 2019
Ordered mesoporous carbons: Implication of surface chemistry, pore structure and adsorption of methyl mercaptan journal August 2005
Rational Synthesis Pathway for Ordered Mesoporous Carbon with Controllable 30- to 100-Angstrom Pores journal February 2008
Standardization of the Boehm titration: Part II. Method of agitation, effect of filtering and dilute titrant journal October 2010
Nucleophilic Catalysis with 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) for the Esterification of Carboxylic Acids with Dimethyl Carbonate journal April 2002
Recent advances in functionalized micro and mesoporous carbon materials: synthesis and applications journal January 2018
Carbon Dioxide as the C1 Source for Direct C−H Functionalization of Aromatic Heterocycles journal August 2010
Carboxylic Acids, Aliphatic book January 2014
Effect of carbon precursors and pore expanding reagent on ordered mesoporous carbon for resorcinol removal journal June 2017
Efficient Chemoselective Carboxylation of Aromatics to Arylcarboxylic Acids with a Superelectrophilically Activated Carbon Dioxide−Al 2 Cl 6 /Al System journal September 2002
Mesoporous carbon with large pore volume and high surface area prepared by a co-assembling route for Lithium-Sulfur Batteries journal October 2014
Recent advances in the synthesis of heterocycles and pharmaceuticals from the photo/electrochemical fixation of carbon dioxide journal January 2021
Carboxylic Acids, Aromatic book June 2000
Carbon dioxide utilization via carbonate-promoted C–H carboxylation journal March 2016
Selective mono- or dimetalation of arenes by means of superbasic reagents journal January 1990
Standardization of the Boehm titration. Part I. CO2 expulsion and endpoint determination journal April 2010
Photocarboxylation of Benzylic C–H Bonds journal July 2019
Direct C–H Carboxylation Forming Polyfunctionalized Aromatic Carboxylic Acids by Combined Brønsted Bases journal January 2022
Fabrication of ordered mesoporous solid super base with high thermal stability from mesoporous carbons journal April 2017
Some aspects of the surface chemistry of carbon blacks and other carbons journal January 1994
Sustainable Conversion of Carbon Dioxide: An Integrated Review of Catalysis and Life Cycle Assessment journal December 2017
Redox-Neutral Photocatalytic C−H Carboxylation of Arenes and Styrenes with CO2 journal October 2020
What are the pKa values of C–H bonds in aromatic heterocyclic compounds in DMSO? journal February 2007
Synthesis of New, Nanoporous Carbon with Hexagonally Ordered Mesostructure journal November 2000
Recent advances in the incorporation of CO2 for C–H and C–C bond functionalization journal January 2021
Nickel/Nickel Oxide in Combination with a Photoredox Catalyst for the Reductive Carboxylation of Unsaturated Hydrocarbons with CO2 under Visible-Light Irradiation journal June 2019
Carbonate-promoted C–H carboxylation of electron-rich heteroarenes journal January 2020
Mesoporous Anatase TiO 2 Beads with High Surface Areas and Controllable Pore Sizes: A Superior Candidate for High-Performance Dye-Sensitized Solar Cells journal June 2009