Related Experiment Video
Updated: Jul 16, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
Stacking interactions as the principal design element in acyl-transfer catalysts
Yin Wei1, Ingmar Held, Hendrik Zipse
1Department Chemie und Biochemie, LMU München, Butenandtstrasse 5-13, D-81377, München, Germany.
Stacking interactions significantly influence the stability and shape of acylpyridinium intermediates during pyridine-catalyzed acylation reactions. These findings are crucial for understanding reaction mechanisms.
Area of Science:
- Computational chemistry
- Organic reaction mechanisms
- Chemical kinetics
Background:
- Pyridine catalysis is widely used in acylation reactions.
- Acylpyridinium intermediates are transient species in these reactions.
- Understanding their properties is key to optimizing reaction conditions.
Purpose of the Study:
- To investigate the conformational properties of acylpyridinium intermediates.
- To determine the factors affecting the stability of these intermediates.
- To elucidate the role of stacking interactions in their behavior.
Main Methods:
- Utilized the SCS-MP2(FC)/6-311 +G(d,p)//MP2(FC)/ 6-31G(d) level of theory for calculations.
- Analyzed conformational preferences of the intermediates.
- Assessed the energetic contributions to intermediate stability.
Main Results:
- Identified key conformational preferences for acylpyridinium intermediates.
- Demonstrated that stacking interactions are critical for intermediate stability.
- Quantified the influence of these interactions on conformational outcomes.
Conclusions:
- Stacking interactions are a decisive factor in acylpyridinium intermediate stability.
- Conformational preferences are strongly linked to these non-covalent interactions.
- This study provides valuable insights into pyridine-catalyzed acylation mechanisms.
More Related Videos
Related Concept Videos
Heterogeneous Catalysis
Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene
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.
Preparation of Alkynes: Alkylation Reaction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview
Catalysis

