Graphene-Based Carbocatalysis in Organic Synthesis

Graphene-based carbocatalysis refers to the use of graphene and its derivatives as metal-free catalysts in organic transformations. Owing to their two-dimensional structure, high surface area, tunable surface chemistry and robust thermal and chemical stability, graphene oxide (GO), reduced graphene oxide (rGO) and related materials have emerged as versatile heterogeneous promoters for bond‐forming reactions. The abundance of oxygenated functional groups—most notably carboxyl, hydroxyl and epoxide moieties—confers Brønsted and Lewis acidity, enabling acid‐catalysed condensations, multicomponent processes and selective oxidations under mild, green conditions. Carbocatalysis with graphene materials avoids metal contamination, offers facile recovery and recycling and can in some cases be coupled to in situ restoration of active sites. Recent advances exploit controlled oxidation and reduction pathways to tune electronic and surface properties, expand substrate scope and integrate carbocatalysis with energy‐relevant reactions, such as electrocatalysis or radical‐mediated coupling. The global significance of graphene carbocatalysts extends from fine chemical synthesis to pharmaceutical intermediates and sustainable bulk processes, underscoring a shift towards eco‐friendly, metal‐free technologies in modern synthetic chemistry.

Research from Nature Portfolio

Recent studies have demonstrated that graphene oxide can act simultaneously as an oxidant and a support in oxidative carbon–hydrogen coupling, selectively forging C–C bonds while converting GO into conductive reduced graphene materials. Investigations into multicomponent synthesis have revealed that optimised GO samples, rich in epoxide and carboxyl groups, serve as regenerable heterogeneous promoters, delivering high yields of nitrogen‐containing heterocycles under mild alcoholic conditions and retaining catalytic activity after multiple cycles. Alternative carbocatalysts derived from complex carbon‐rich feedstocks have also been introduced: asphaltene oxide, sourced from petroleum residues, shows enhanced thermal stability compared with GO and effectively promotes condensations, cross‐couplings and indole syntheses even under microwave irradiation. Comparative analyses of GO, rGO and pristine graphene further highlight how controlled oxidation and reduction tailor active sites for specific reactions, offering a framework to align material properties with catalytic performance.

Graphene-Based Carbocatalysis in Organic Synthesis publication trend

The graph below shows the total number of articles in graphene-based carbocatalysis in organic synthesis across all publications each year (not limited to Nature Index journals).

Technical terms

Graphene oxide (GO): A two‐dimensional carbon material with oxygenated functional groups conferring acidity and dispersibility.

Reduced graphene oxide (rGO): A partially deoxygenated form of GO with enhanced electrical conductivity and modified catalytic properties.

Carbocatalysis: Catalysis mediated by carbon materials rather than metals, exploiting surface functionalities to promote organic reactions.

Brønsted acidity: Proton‐donating capability of surface groups, important for acid‐catalysed condensations and rearrangements.

Lewis acidity: Electron‐accepting character of surface sites (e.g. epoxide‐derived centres) enabling activation of electron‐rich substrates.

Multicomponent reaction: A process wherein three or more reactants combine in a single step to form a product incorporating segments of all inputs, often catalysed by GO.

References

1. Graphene-Based Nanomaterials as Heterogeneous Acid Catalysts: A Comprehensive Perspective. Molecules (2014).
2. Concurrent Formation of Carbon–Carbon Bonds and Functionalized Graphene by Oxidative Carbon-Hydrogen Coupling Reaction. Scientific Reports (2016).
3. Regenerable Acidity of Graphene Oxide in Promoting Multicomponent Organic Synthesis. Scientific Reports (2019).
4. Asphaltene oxide promotes a broad range of synthetic transformations. Communications Chemistry (2019).
5. Green Oxidation of Carbon Black by Dry Ball Milling. ACS Sustainable Chemistry & Engineering (2022).
6. Soluble asphaltene oxide: a homogeneous carbocatalyst that promotes synthetic transformations. RSC Advances (2020).