Synthesis of diynes, .alpha.,.beta.-unsaturated monoacids and diacids by the selective palladium(0)-catalyzed and phase transfer catalyzed reactions of vinylic dibromides

1983 ◽  
Vol 2 (7) ◽  
pp. 801-805 ◽  
Author(s):  
Vilmos Galamb ◽  
Madhuban Gopal ◽  
Howard Alper
Keyword(s):  
Phase Transfer ◽  
Alpha Beta ◽  
Catalyzed Reactions

scholarly journals Interfacial Processes—The Key Steps of Phase Transfer Catalyzed Reactions

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1436
Author(s):  
Mieczysław Mąkosza ◽  
Michał Fedoryński
Keyword(s):  
Experimental Evidence ◽  
Phase Transfer ◽  
Initial Step ◽  
Organic Anions ◽  
Two Phase ◽  
Interfacial Processes ◽  
Phase Systems ◽  
Catalyzed Reactions ◽  
Key Steps

After short historical introduction, interfacial mechanism of phase transfer catalyzed (PTC) reactions of organic anions, induced by aqueous NaOH or KOH in two-phase systems is formulated. Subsequently experimental evidence that supports the interfacial deprotonation as the key initial step of these reactions is presented.

scholarly journals The Metal-Catalyzed Reactions of Alanine Decyl Ester under Phase-Transfer Conditions Using Cross-Linked Polystyrenes with Acidic Groups.

1995 ◽  
Vol 52 (8) ◽  
pp. 518-523
Author(s):  
Noritaka OHTANI ◽  
Yukihiko INOUE ◽  
Ichiro TAKEISHI ◽  
Keisuke MATSUDA
Keyword(s):  
Phase Transfer ◽  
Catalyzed Reactions ◽  
Metal Catalyzed

scholarly journals Synthesis of Galectin Inhibitors by Regioselective 3′-O-Sulfation of Vanillin Lactosides Obtained under Phase Transfer Catalysis

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 115
Author(s):  
Karima Belkhadem ◽  
Yihong Cao ◽  
René Roy
Keyword(s):  
Carboxylic Acid ◽  
Sulfur Trioxide ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Aldehyde Group ◽  
Para Position ◽  
Knoevenagel Reaction ◽  
Aromatic Residue ◽  
Unsaturated Carboxylic Acid ◽  
Catalyzed Reactions

Vanillin-based lactoside derivatives were synthetized using phase-transfer catalyzed reactions from per-O-acetylated lactosyl bromide. The aldehyde group of the vanillin moiety was then modified to generate a series of related analogs having variable functionalities in the para- position of the aromatic residue. The corresponding unprotected lactosides, obtained by Zemplén transesterification, were regioselectively 3′-O-sulfated using tin chemistry activation followed by treatment with sulfur trioxide-trimethylamine complex (Men3N-SO3). Additional derivatives were also prepared from the vanillin’s aldehyde using a Knoevenagel reaction to provide extended α, β-unsaturated carboxylic acid which was next reduced to the saturated counterpart.

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