Paper Title
Selective synthesis of sulfoxides from sulfides using ultrasound
Keywords
- Selective Sulfoxide Synthesis
- Sulfide Oxidation
- Ultrasound-Assisted Synthesis
- Methyl Phenyl Sulfide
- Ultrasonic Bath
- Sonochemical Reactions
- Frequency 22 kHz
- Power Dissipation 40 W
- Hydrogen Peroxide Oxidation
- Catalyst Selection
- Sodium Tungstate Catalyst
- Ammonium Molybdate Catalyst
- Optimized Reaction Conditions
- Periodic Hydrogen Peroxide Addition
- High Selectivity
- Sulfone Formation Suppression
- Green Chemistry
- Eco-Friendly Oxidation
- Sustainable Organic Synthesis
- Sonochemistry Applications
- Heterogeneous Catalysis
Journal
Research Impact Tools
Publication Info
Volume: 14 | Issue: 2 | Pages: 135-142
Published On
February, 2007
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Abstract
The present work aims at developing a new process to selectively synthesize sulfoxide from sulfides using ultrasound. Methyl phenyl sulfide (MPS) has been taken as a model reactant. The reaction has been carried out in ultrasonic bath with an operating frequency of 22 kHz and maximum power supply of 120 W with an actual power dissipation of ∼40 W measured using calorimetric studies. Effect of various parameters such as presence and absence of catalyst, type of catalyst (catalysts used were sodium tungstate and ammonium molybdate), temperature, concentration of hydrogen peroxide, effect of molar ratio of MPS to H2O2 has been investigated with an aim of obtaining the optimum conditions for the synthesis of sulfoxides. It was observed that the presence of catalyst is a must to achieve appreciable conversions. It was also observed that the periodic addition of stoichiometric amount of hydrogen peroxide instead of sudden addition of it (total quantity of hydrogen peroxide remains the same) gave better selectivity for sulfoxide. The maximum conversion achieved in the present work was ∼88.42% with sulfone formation being only 0.4% indicating a 99.6% selectivity for the desired product i.e. sulfoxides.
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