Related Experiment Video
Updated: Jul 29, 2026
Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
Published on: April 4, 2014
Highly selective catalytic intermolecular reductive coupling of alkynes and aldehydes
1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
This study introduces a novel catalytic reaction coupling alkynes and aldehydes to form allylic alcohols. The process offers high stereoselectivity and regioselectivity, crucial for synthesizing complex organic molecules.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Alkynes and aldehydes are fundamental building blocks in organic synthesis.
- Developing efficient methods for their coupling is essential for creating diverse molecular architectures.
Purpose of the Study:
- To develop a single catalytic reaction for the reductive coupling of alkynes and aldehydes.
- To achieve high stereoselectivity and regioselectivity in the formation of allylic alcohols.
Main Methods:
- Utilized a catalytic system for the reductive coupling of internal and terminal alkynes with aromatic and aliphatic aldehydes.
- Investigated the influence of phosphine ligands on reaction outcomes.
- Optimized the alkyne to aldehyde ratio for efficient coupling.
Main Results:
- Successfully synthesized di- and trisubstituted allylic alcohols with high stereoselectivity and regioselectivity.
- Demonstrated that a 1:1 ratio of alkyne to aldehyde is often sufficient.
- Identified phosphine ligands as critical factors influencing yield and regioselectivity.
- Observed consistent cis addition to the alkyne in all allylic alcohol products.
Conclusions:
- The developed catalytic reaction provides an efficient route to stereoselective and regioselective allylic alcohols.
- The choice of phosphine ligand is key to controlling the reaction's outcome.
- This method expands the synthetic toolbox for accessing valuable organic intermediates.
More Related Videos
06:46Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
09:54Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
Published on: September 12, 2018
Related Concept Videos
02:17Reduction 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...
02:40Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
02:24Reduction 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.
01:22Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction
01:19α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview