Synthesis of aromatic polyether by phase-transfer-catalyzed polycondensation with quaternary ammonium salts, crown ethers, and poly(ethylene glycol)s

1979 ◽  
Vol 17 (2) ◽  
pp. 85-89 ◽  
Author(s):  
Yoshio Imai ◽  
Mitsuru Ueda ◽  
Masahiro Ii
Keyword(s):  
Ethylene Glycol ◽  
Crown Ethers ◽  
Quaternary Ammonium ◽  
Phase Transfer ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

A Poly(ethylene glycol)-Supported Quaternary Ammonium Salt:  An Efficient, Recoverable, and Recyclable Phase-Transfer Catalyst

2000 ◽  
Vol 2 (12) ◽  
pp. 1737-1739 ◽  
Author(s):  
Rita Annunziata ◽  
Maurizio Benaglia ◽  
Mauro Cinquini ◽  
Franco Cozzi ◽  
Graziella Tocco
Keyword(s):  
Ethylene Glycol ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

scholarly journals A Remarkably Efficient Phase-Transfer Catalyzed Amination of α-Bromo-α, β-Unsaturated Ketones in Water

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Alemayehu Mekonnen ◽  
Alemu Tesfaye
Keyword(s):  
Quaternary Ammonium ◽  
Phase Transfer ◽  
Conjugate Addition ◽  
Quaternary Ammonium Salts ◽  
Cinchona Alkaloids ◽  
Ammonium Salts ◽  
Alkylation Reaction ◽  
Pt Catalysts ◽  
Unsaturated Ketones ◽  
Catalytic Performances

Tandem conjugate addition–alkylation reaction of various amines with α-bromo-α, β-unsaturated ketones resulted in near-quantitative conversions into the corresponding aziridines when the reaction was carried out in the presence of 10 mol% of phase-transfer, PT catalysts in water. Some chiral quaternary ammonium salts derived from Cinchona alkaloids were investigated as water-stable PT catalysts. The scope and limitations of the reaction have also been investigated. The catalytic performances were significantly improved in comparison with the corresponding ordinary quaternary ammonium salt catalysts, and excellent yields (81%–96%) were obtained. Although an increase in the rate of aziridination has been accomplished, no stereoselectivity was observed. The positive values of the protocol have been confirmed.

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