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Oxidation in three-liquid-phase microemulsion systems using "Balanced Catalytic Surfactants".
Véronique Nardello-Rataj1, Laurent Caron, Cédric Borde
1LCOM, Equipe Oxydation et Physico-Chimie de la Formulation, UMR CNRS 8009, Cité Scientifique, ENSCL, BP 90108, F-59652 Villeneuve d'Ascq, France.
Journal of the American Chemical Society
|October 16, 2008
Summary
New balanced catalytic surfactants (BCS) enable efficient dark singlet [4 + 2] cyclooxygenation reactions in three-liquid-phase microemulsions. These systems offer advantages over traditional methods for oxidizing organic substrates.
Area of Science:
- Organic Chemistry
- Supramolecular Chemistry
- Green Chemistry
Background:
- Development of novel catalytic systems for organic synthesis.
- Challenges in achieving efficient cyclooxygenation reactions.
- Exploration of microemulsion systems for chemical transformations.
Purpose of the Study:
- To synthesize and characterize novel balanced catalytic surfactants (BCS).
- To investigate the application of BCS in three-liquid-phase microemulsion systems for dark singlet [4 + 2] cyclooxygenation.
- To evaluate the advantages of these systems over conventional methods.
Main Methods:
- Synthesis of amphiphilic double-tailed quaternary ammonium surfactants with molybdate counterions.
- Formation of three-liquid-phase microemulsion systems at room temperature.
- Comparative peroxidation studies using rubrene.
- Preparative peroxidation of alpha-terpinene and 1,4,5-trimethylnaphtalene.
Main Results:
- Successfully developed BCS surfactants [(Cn)2N(C1)2]2MoO4 (n = 8, 9, 10, 12).
- Demonstrated the formation of stable three-liquid-phase microemulsions without cosurfactants or electrolytes.
- Showcased advantages including fewer components, low surfactant amounts, water dilution insensitivity, rapid phase separation, and easy product/surfactant recovery.
- Achieved efficient peroxidation of various organic substrates, including poorly reactive ones.
Conclusions:
- Balanced Catalytic Surfactants (BCS) are effective catalysts for dark singlet [4 + 2] cyclooxygenation in three-liquid-phase microemulsions.
- These systems offer significant advantages in terms of efficiency, simplicity, and sustainability.
- The developed systems show broad applicability for oxidizing diverse organic substrates and reusability of the catalyst.
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