Osmium tetroxide in poly(ethylene glycol) (PEG): a recyclable reaction medium for rapid asymmetric dihydroxylation under Sharpless conditionsDedicated to Prof. Goverdhan Mehta on his 60th birthday.Electronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b3/b305154b/

2003 ◽  
pp. 1716 ◽  
Author(s):  
S. Chandrasekhar ◽  
Ch. Narsihmulu ◽  
S. Shameem Sultana ◽  
N. Ramakrishna Reddy
Keyword(s):  
Ethylene Glycol ◽  
Osmium Tetroxide ◽  
Reaction Medium ◽  
Supplementary Information ◽  
Poly Ethylene Glycol ◽  
Asymmetric Dihydroxylation ◽  
Poly Ethylene

Direct Synthesis of Deep Cavity p-Phenylcalix[4]arene in Poly(Ethylene Glycol), and its Self-Association in the Solid State

2006 ◽  
Vol 59 (4) ◽  
pp. 260 ◽  
Author(s):  
Mohamed Makha ◽  
Colin L. Raston ◽  
Alexandre N. Sobolev
Keyword(s):  
Solid State ◽  
Ethylene Glycol ◽  
Direct Synthesis ◽  
Reaction Medium ◽  
State Structure ◽  
Poly Ethylene Glycol ◽  
Solid State Structure ◽  
Deep Cavity ◽  
Self Association ◽  
Poly Ethylene

p-Phenylcalix[4]arene is formed directly from p-phenylphenol in 66% yield (50% isolated yield) using poly(ethylene glycol) as the reaction medium, with crystallization of the pure cavitand from toluene mediated by p-carborane. The solid-state structure comprises interlocking columnar arrays.

Asymmetric allylic substitution of cycloalkenyl esters in water with an amphiphilic resin-supported chiral palladium complex

2007 ◽  
Vol 79 (9) ◽  
pp. 1481-1489 ◽  
Author(s):  
Yasuhiro Uozumi
Keyword(s):  
Ethylene Glycol ◽  
Palladium Complex ◽  
Reaction Medium ◽  
Optically Active ◽  
Racemic Mixture ◽  
Poly Ethylene Glycol ◽  
Supported Palladium ◽  
Poly Ethylene ◽  
Phosphine Complex ◽  
Single Reaction

A novel homochiral phosphine ligand, (3R,9aS)[2-aryl-3-(2-diphenylphosphino)phenyl]tetrahydro-1H-imidazo[1,5-a]indole-1-one, was designed, prepared, and anchored onto an amphiphilic polystyrene-poly(ethylene glycol) copolymer (PS-PEG) resin. Catalytic asymmetric substitution of a racemic mixture of cycloalkenyl esters with carbon, nitrogen, and oxygen nucleophiles was achieved in water as the single reaction medium under heterogeneous conditions by using the PS-PEG resin-supported palladium-imidazoindole phosphine complex to give optically active substituted cycloalkenes with up to 99 % ee.

Poly(ethylene glycol): an Alternative Solvent for the Synthesis of Cyclic Carbonate from Vicinal Halohydrin and Carbon Dioxide

2009 ◽  
Vol 62 (8) ◽  
pp. 917 ◽  
Author(s):  
Jing-Lun Wang ◽  
Liang-Nian He ◽  
Xiao-Yong Dou ◽  
Fang Wu
Keyword(s):  
Carbon Dioxide ◽  
Ethylene Glycol ◽  
Reaction Medium ◽  
Cyclic Carbonate ◽  
High Yield ◽  
Cyclic Carbonates ◽  
Poly Ethylene Glycol ◽  
Potential Applications ◽  
Ready Availability ◽  
Poly Ethylene

Poly(ethylene glycol) (PEG) in this work proved to be an efficient reaction medium for the reaction of vicinal halohydrin with carbon dioxide in the presence of a base to synthesise cyclic carbonates. Notably, PEG-400 as an environmentally friendly solvent exhibits a unique influence on reactivity compared with conventional organic solvents. Various cyclic carbonates were prepared in high yield employing this protocol. The process presented here has potential applications in the industrial production of cyclic carbonates because of its simplicity, cost benefits, ready availability of starting materials, and mild reaction conditions.

scholarly journals Preparation of Poly(ethylene glycol)@Polyurea Microcapsules Using Oil/Oil Emulsions and Their Application as Microreactors

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2566
Author(s):  
Ahmad Zarour ◽  
Suheir Omar ◽  
Raed Abu-Reziq
Keyword(s):  
Ethylene Glycol ◽  
Interfacial Polymerization ◽  
Reaction Medium ◽  
Catalytic Performance ◽  
Polymeric Surfactant ◽  
Poly Ethylene Glycol ◽  
Ethylene Imine ◽  
Catalytic Core ◽  
Poly Ethylene ◽  
Oil Emulsions

The development process of catalytic core/shell microreactors, possessing a poly(ethylene glycol) (PEG) core and a polyurea (PU) shell, by implementing an emulsion-templated non-aqueous encapsulation method, is presented. The microreactors’ fabrication process begins with an emulsification process utilizing an oil-in-oil (o/o) emulsion of PEG-in-heptane, stabilized by a polymeric surfactant. Next, a reaction between a poly(ethylene imine) (PEI) and a toluene-2,4-diisocyanate (TDI) takes place at the boundary of the emulsion droplets, resulting in the creation of a PU shell through an interfacial polymerization (IFP) process. The microreactors were loaded with palladium nanoparticles (NPs) and were utilized for the hydrogenation of alkenes and alkynes. Importantly, it was found that PEG has a positive effect on the catalytic performance of the developed microreactors. Interestingly, besides being an efficient green reaction medium, PEG plays two crucial roles: first, it reduces the palladium ions to palladium NPs; thus, it avoids the unnecessary use of additional reducing agents. Second, it stabilizes the palladium NPs and prevents their aggregation, allowing the formation of highly reactive palladium NPs. Strikingly, in one sense, the suggested system affords highly reactive semi-homogeneous catalysis, whereas in another sense, it enables the facile, rapid, and inexpensive recovery of the catalytic microreactor by simple centrifugation. The durable microreactors exhibit excellent activity and were recycled nine times without any loss in their reactivity.

scholarly journals Poly(ethylene glycol) as reaction medium for mild Mizoroki–Heck reaction in a ball-mill

2012 ◽  
Vol 48 (96) ◽  
pp. 11778 ◽  
Author(s):  
Valérie Declerck ◽  
Evelina Colacino ◽  
Xavier Bantreil ◽  
Jean Martinez ◽  
Frédéric Lamaty
Keyword(s):  
Ethylene Glycol ◽  
Heck Reaction ◽  
Ball Mill ◽  
Reaction Medium ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Poly(ethylene glycol) (PEG) as an efficient and recyclable reaction medium for the synthesis of dibenz[b,f]-1,4-oxazepine

2008 ◽  
Vol 49 (9) ◽  
pp. 1495-1497 ◽  
Author(s):  
Yogesh R. Jorapur ◽  
Gurusamy Rajagopal ◽  
Prakash J. Saikia ◽  
Ravindra R. Pal
Keyword(s):  
Ethylene Glycol ◽  
Reaction Medium ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Ligand-Free and Recyclable Palladium(II) Acetate Catalyzes the Decarboxylative Cross-Coupling of Alkynyl Carboxylic Acids with Arylboronic Acids in Aqueous PEG-400

Synlett ◽  
2020 ◽  
Vol 31 (08) ◽  
pp. 793-796
Author(s):  
Bo-Xiao Tang ◽  
Hong Zou ◽  
Bao-Xing Xie ◽  
Hai-Qing Zhong ◽  
Yi-Hua Wang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Catalytic System ◽  
Reaction Medium ◽  
Cross Coupling ◽  
Poly Ethylene Glycol ◽  
Arylboronic Acids ◽  
Peg 400 ◽  
Ligand Free ◽  
Internal Alkynes ◽  
Poly Ethylene

A novel and ligand-free method was developed for the decarboxylative cross-coupling of alkynylcarboxylic acids with arylboronic acids. By using an environmentally friendly H2O–poly(ethylene glycol) (PEG-400) system as the reaction medium, a series of internal alkynes were synthesized in good yields and with remarkable selectivity. The Pd(OAc)2–H2O–PEG-400 catalytic system could be used for up to three cycles without any loss of activity, demonstrating the robustness of the approach.

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