scholarly journals Ultrasound-assisted phase-transfer catalysis: Benzoylation of sodium 4-acetylphenoxide by dual-site phase-transfer catalyst in a tri-liquid system

2011 ◽  
Vol 18 (1) ◽  
pp. 363-369 ◽  
Author(s):  
Hung-Ming Yang ◽  
Chun-Cheng Chiu
Keyword(s):  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Liquid System ◽  
Phase Transfer Catalyst ◽  
Ultrasound Assisted ◽  
Dual Site

scholarly journals Ultrasound-Assisted Green Synthesis of Dialkyl Peroxides under Phase-Transfer Catalysis Conditions

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 118 ◽  
Author(s):  
Daniel Kopeć ◽  
Stefan Baj ◽  
Agnieszka Siewniak
Keyword(s):  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Reaction Times ◽  
Liquid System ◽  
Significant Loss ◽  
Multiple Use ◽  
Alkyl Hydroperoxides ◽  
Ultrasound Assisted ◽  
Dialkyl Peroxides ◽  
High Yields

The dialkyl peroxides, which contain a thermally unstable oxygen–oxygen bond, are an important source of radical initiators and cross-linking agents. New efficient and green methods for their synthesis are still being sought. Herein, ultrasound-assisted synthesis of dialkyl peroxides from alkyl hydroperoxides and alkyl bromides in the presence of an aqueous solution of an inorganic base was systematically studied under phase-transfer catalysis (PTC) conditions. The process run in a tri-liquid system in which polyethylene glycol as a phase-transfer catalyst formed a third liquid phase between the organic and inorganic phases. The use of ultrasound provided high yields of organic peroxides (70–99%) in significantly shorter reaction times (1.5 h) in comparison to reaction with magnetic stirring (5.0 h). In turn, conducting the reaction in the tri-liquid PTC system allowed easy separation of the catalyst and its multiple use without significant loss of activity.

PHASE TRANSFER CATALYSIS IN SOLID–LIQUID SYSTEM AS A SELECTIVE METHOD OF MONO-ALKYLATION OF α-SULFONYL THIOESTERS

2002 ◽  
Vol 32 (10) ◽  
pp. 1483-1487 ◽  
Author(s):  
Blanka Wladislaw ◽  
Liliana Marzorati ◽  
Regina M. A. Neves ◽  
Claudio Di Vitta
Keyword(s):  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Liquid System ◽  
Selective Method ◽  
Solid Liquid
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