scholarly journals The role of onium salts in the oxidation of hydrocarbons by O2 catalysed by cationic phase-transfer reagents

2000 ◽  
Vol 2 (17) ◽  
pp. 3801-3805 ◽  
Author(s):  
László J. Csányi ◽  
Károly Jáky ◽  
István Pálinkó ◽  
Antal Rockenbauer ◽  
László Korecz
Keyword(s):  
Phase Transfer ◽  
Oxidation Of Hydrocarbons ◽  
Onium Salts

The Role of Phase Transfer Catalysis in the Microwave-Assisted N-Benzylation of Amides, Imides and N-Heterocycles

2009 ◽  
Vol 6 (7) ◽  
pp. 529-534 ◽  
Author(s):  
Istvan Greiner ◽  
Fanni Sypaseuth ◽  
Alajos Grun ◽  
Eva Karsai ◽  
Gyorgy Keglevich
Keyword(s):  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Microwave Assisted

Green Application of Phase-Transfer Catalysis in Oxidation: A Comprehensive Review

2020 ◽  
Vol 17 (4) ◽  
pp. 405-411
Author(s):  
Chuan-Hui Wang ◽  
Chen-Fu Liu ◽  
Guo-Wu Rao
Keyword(s):  
Organic Chemistry ◽  
Green Chemistry ◽  
Oxidation Reaction ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Important Application ◽  
Oxidation Reactions ◽  
Comprehensive Review ◽  
Phase Transfer Catalysts ◽  
Onium Salts

Oxidation reactions have emerged as one of the most versatile tools in organic chemistry. Various onium salts such as ammonium, phosphonium, arsonium, bismuthonium, tellurium have been used as phase transfer catalysts in many oxidation reactions. Certainly, considerable catalysts have been widely used in Phase-Transfer Catalysis (PTC). This review focuses on the application of PTC in various oxidation reaction. Furthermore, PTC also conforms to the concept of “Green Chemistry”. <p></p> • Oxidation has become one of the most widely used tools in organic chemistry and phase transfer catalysts has been widely used in oxidation. <p></p> • The application of phase transfer catalysts in oxidation reaction will be summarized. <p></p> • Phase transfer catalysts have important application in various oxidation reaction.

Polystyrene-Supported Onium Salts as Phase-Transfer Catalysts

1997 ◽  
pp. 248-260 ◽  
Author(s):  
Noritaka Ohtani ◽  
Yukihiko Inoue ◽  
Jun Mukudai ◽  
Tsuyoshi Yamashita
Keyword(s):  
Phase Transfer ◽  
Phase Transfer Catalysts ◽  
Onium Salts

The Scission of Polysulfide Crosslinks in Scrap Rubber Particles through Phase Transfer Catalysis

1982 ◽  
Vol 55 (5) ◽  
pp. 1499-1515 ◽  
Author(s):  
Paul P. Nicholas
Keyword(s):  
Phase Transfer ◽  
Alkylating Agents ◽  
Decomposition Reaction ◽  
Chain Scission ◽  
Model Studies ◽  
Low Viscosity ◽  
Diffusion Controlled ◽  
Onium Salts ◽  
Rubber Particles ◽  
Rate Behavior

Abstract Hydroxide ions transported by onium ions from water into swollen rubber particles rapidly break polysulfide crosslinks with little or no main chain scission. However, methylated monosulfide crosslinks do not cleave under these conditions. The reaction is not truly catalytic because the quaternary ammonium is decomposed. Model studies with N-methyl-N,N,N-tri-n-alkylammonium chlorides and di-2-cyclohexen-1-yl disulfide show that the decomposition reaction involves a highly selective methylation of the thiolate intermediate. However, catalyst decomposition can be inhibited with added alkylating agents. Alkylating agents also improve catalyst efficiency during devulcanization. The Hofmann reaction is yet another route for catalyst decomposition, but the rate is too slow to be competitive. Several onium salts have been examined in this process. In general, those having several large alkyl substituents are the better performers, consistent with the known partitioning/reaction rate behavior of such catalysts in simple, low viscosity solvents. However, with N-methyl-N,N,N-tri-n-alkylammonium chlorides, the rate decreases as the tri-n-alkyl substituents become very large, e.g., C18H37. This may originate from a slow, diffusion-controlled reaction that is peculiar to the network structure of the swollen vulcanizate.

ChemInform Abstract: Key Role of Water for Nucleophilic Substitutions in Phase Transfer Catalyzed Processes.

ChemInform ◽  
2010 ◽  
Vol 32 (37) ◽  
pp. no-no
Author(s):  
Domenico Albanese ◽  
Dario Landini ◽  
Angelamaria Maia ◽  
Michele Penso
Keyword(s):  
Phase Transfer ◽  
Nucleophilic Substitutions

Role of a third liquid phase in phase-transfer catalysis

1991 ◽  
Vol 56 (26) ◽  
pp. 7229-7232 ◽  
Author(s):  
Doron Mason ◽  
Shlomo Magdassi ◽  
Yoel Sasson
Keyword(s):  
Liquid Phase ◽  
Phase Transfer Catalysis ◽  
Phase Transfer
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