403842-84-2Relevant articles and documents
Probing a gas/liquid acid-base reaction by X-ray photoelectron spectroscopy
Niedermaier, Inga,Taccardi, Nicola,Wasserscheid, Peter,Maier, Florian,Steinrueck, Hans-Peter
, p. 8904 - 8907 (2013)
A mechanistic study: In a Bronsted acid/base reaction, gaseous triflic acid (OTfH) transfers its proton to the basic Cl- anion of the ionic liquid [C8C1Im]Cl forming volatile HCl and the IL [C8C1Im][TfO]. This anion exchange reaction is monitored in the near-surface region quantitatively by X-ray photoelectron spectroscopy as a function of time (see picture; BE=binding energy). Copyright
A convenient synthesis of triflate anion ionic liquids and their properties
Ignat'ev, Nikolai V.,Barthen, Peter,Kucheryna, Andryi,Willner, Helge,Sartori, Peter
experimental part, p. 5319 - 5338 (2012/08/28)
A solvent- and halogen-free synthesis of high purity triflate ionic liquids via direct alkylation of organic bases (amines, phosphines or heterocyclic compounds) with methyl and ethyl trifluoromethanesulfonate (methyl and ethyl triflate) has been developed. Cheap and non-toxic dimethyl and diethyl carbonate serve as source for the methyl and ethyl groups in the preparation of methyl and ethyl triflate by this invented process. The properties of ionic liquids containing the triflate anion are determined and discussed.
Preparation of second generation ionic liquids by efficient solvent-free alkylation of N-heterocycles with chloroalkanes
Cravotto, Giancarlo,Gaudino, Emanuela Calcio,Boffa, Luisa,Leveque, Jean-Marc,Estager, Julien,Bonrath, Werner
, p. 149 - 156 (2008/09/17)
Non-conventional techniques, such as microwave (MW) and power ultrasound (US) as well as combined MW/US irradiation, have been used to promote one-pot synthesis of second-generation ionic liquids (ILs), cutting down reaction times and improving yields. However, the use of chloroalkanes in the alkylation of N-heterocycles requires more drastic conditions if results are to match those obtained with more reactive alkyl halides. The present paper describes a series of MW- or MW/US-promoted IL preparations starting from chloroalkanes and classic heterocycles (1-methylimidazole, pyridine and 1-methylpyrrolidine). When reactions were carried out under conventional heating in an oil bath they required longer reaction times and gave poorer yields. 1H-NMR analysis and ion-exchange chromatography showed that the present solventless procedure afforded ILs of satisfactory purity. The observed high yields (usually 70-98% isolated), and short reaction times showed that a straightforward access to ILs can be also achieved with the use of alkyl chlorides, resulting in a considerable reduction of costs.
