Related Experiment Video
Updated: Jul 9, 2026

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
Published on: November 9, 2019
Continuous catalytic "one-pot" multi-step synthesis of 2-ethylhexanal from crotonaldehyde
Tsunetake Seki1, Jan-dierk Grunwaldt, Alfons Baiker
1Department of Chemistry and Applied Biosciences, ETH Zurich, Hönggerberg, CH-8093 Zurich, Switzerland.
A novel method synthesizes 2-ethylhexanal from crotonaldehyde using a palladium catalyst in supercritical carbon dioxide. This process combines hydrogenation and aldol condensation for efficient chemical production.
Area of Science:
- Catalysis
- Green Chemistry
- Organic Synthesis
Background:
- Supercritical carbon dioxide (scCO2) offers unique solvent properties for chemical reactions.
- Bifunctional catalysts enable multiple reaction steps in a single process.
- Aldol condensation and hydrogenation are key organic transformations.
Purpose of the Study:
- To develop a direct synthesis of 2-ethylhexanal from crotonaldehyde.
- To investigate the efficacy of a resin-supported palladium catalyst in scCO2.
- To combine hydrogenation and aldol condensation in a one-pot reaction.
Main Methods:
- Utilized a bifunctional acidic resin-supported palladium catalyst.
- Employed supercritical carbon dioxide as the reaction medium.
- Performed direct synthesis from crotonaldehyde via hydrogenation and aldol condensation.
Main Results:
- Successfully synthesized 2-ethylhexanal directly from crotonaldehyde.
- Demonstrated the effectiveness of the bifunctional catalyst in scCO2.
- Achieved a one-pot reaction combining two distinct chemical transformations.
Conclusions:
- The developed method provides an efficient route to 2-ethylhexanal.
- Supercritical CO2 is a viable medium for this catalytic process.
- Resin-supported catalysts show promise for integrated chemical synthesis.
More Related Videos
09:35Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
Published on: September 18, 2016
10:12Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
Published on: April 4, 2014
Related Concept Videos
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Alkylation of β-Diester Enolates: Malonic Ester Synthesis
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...