1,721,043 research outputs found
An Efficient Combined Electrochemical and Ultrasound Assisted Synthesis of Imidazole-2-Thiones
No full textThe electrochemical reduction of 1,3-dialkylimidazolium ionic liquids gave the corresponding N-heterocyclic carbenes that, after reaction with elemental sulfur and ultrasound irradiation, yielded 1,3-dialkylimidazole-2-thiones in very high yields. The reaction is very clean, produces no side-products and avoids the use of any other added reagent
A simple and convenient method for preparation of sulfides
No full textTetraethylammonium hydrogen carbonate (TEAHC) and tetraethylammonium carbonate (TEAC) obtained respectively by chemical and electrochemical way, react with thiols in acetonitrile affording, after addition of a suitable alkylating reagent, the corresponding sulfides in high to excellent yields
The reaction of amines with an electrogenerated base. Improved synthesis of arylcarbamic esters
No full textThe electrogenerated base of 2-pyrrolidone reacts with amines and anilines yielding the corresponding alkyl and aryl carbamates, after addition of carbon dioxide and ethyl iodide. Arylcarbamic esters are obtained in very good yields under mild reaction conditions with respect to the methods so far reported. (C) 2000 Elsevier Science Ltd. All rights reserved
Erratum: Internal redox amidation of α,β-unsaturated aldehydes in ionic liquids. the electrochemical route (Electrochimica Acta (2013) 89:(692-699))
No full textElectrogenerated cyanomethyl anion in organic synthesis
No full textSuitable electrochemical methodologies for the generation of cyanomethyl anion and some electrochemically induced cyanomethylation reactions of electrophilic substrates are described and discussed. In addition, the electrochemical syntheses of carbamates and chiral oxazolidin-2-ones (under mild conditions and avoiding the use of hazardous chemicals), via a new carboxylating reagent (CH2CN-/CO2), are reported in this article
Electrochemical activation of carbon dioxide: Synthesis of organic carbonates.
No full textElectrochemically activated CO2 reacts, under mild conditions, with primary and secondary alcohols bearing a leaving group at the alpha-position affording the corresponding cyclic carbonates in high yields; unsubstituted alcohols are converted, after addition of EtI, into the corresponding unsymmetrical ethyl carbonates in moderate to good yields. Tertiary alcohols and phenols are stable to the reagent
Room Temperature Ionic Liquids (RTILs) Versus Volatile Organic Compounds (VOCs) in Organic Electrosynthesis: The Requirement of a Careful Comparison
No full textA convenient method for the synthesis of carbamate esters from amines and tetraethylammonium hydrogen carbonate
No full textThe double role of ionic liquids in organic electrosynthesis: Precursors of N-heterocyclic carbenes and green solvents. Henry reaction
No full textN-heterocyclic carbenes, electrogenerated by cathodic reduction of imidazolium-based room temperature ionic liquids (RTILs), are stable bases able to catalyze the Henry reaction. Accordingly, the electrosynthesis of beta-nitroalcohols has been achieved, under mild conditions and in high yields, by stirring nitromethane and aldehydes in previously electrolyzed RTILs. RTILs have been used as green solvents as well as precursors of N-heterocyclic carbenes. (c) 2009 Elsevier B.V. All rights reserved
Electrogenerated base-induced N-acylation of chiral oxazolidin-2-ones. 2
No full textAn improved and efficient electrochemical N-acylation of chiral oxazolidin-2-ones has been achieved. The generation of the nitrogen anion is obtained under mild conditions and without addition of base or probase, by direct electrolysis of a solution of MeCN-TEAP containing the oxazolidinone. Acylation agents (acid chlorides or anhydrides) were added at the end of the electrolysis. N-Acylated products were isolated in high to excellent yields
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