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Abstract
A green microwave-assisted procedure for the preparation of a series of fifteen new N-alkylpyridazinium ionic liquids with different functionality in the alkyl chain is described. For the first time, target ionic liquids were prepared using standard methodology and under microwave irradiation in short duration of time with quantitative yields. In most cases, the microwave-assisted reaction is an environmentally friendly alternative to traditional methods.
Highlights
Over the past few decades the number of publications concerning room-temperature ionic liquids (RTILs) has increased substantially [1]. (RTILs) provide a new class of solvents where molecules are composed of ions
We have synthesized a variety of a variety of new pyridazinium-based ionic liquids by microwave heating and the protocol is compared with the similar preparation using conventional heating
Under standard conditions (SC1: toluene, 80 ̊C, 18 h), the nucleophilic alkylation of pyridazine with different alkyl halides with different molar ratios (1:1.1; 1:2 and 1:3 eq) afforded the corresponding monopyridiazinium halides in 78% - 89% yield as solid powder after solvent removal by filtration (Scheme 1) [18]
Summary
Over the past few decades the number of publications concerning room-temperature ionic liquids (RTILs) has increased substantially [1]. (RTILs) provide a new class of solvents where molecules are composed of ions. Ionic liquids have essentially zerovapor pressure and are thermally stable over a wide range of temperature. They are considered as environmentally friendly alternatives to the classical use of organic solvents. RTILs have been widely investigated for a variety of applications: the use as solvents or catalysts for chemical synthesis [2,3], media for electrodeposition of metals [4,5,6], electrolyte for electrochemical devices such as battery [7], supercapacitors [8,9], as inhibitors of corrosion and as fluids for thermal storage and exchange in solar concentrating power plants [10,11]. The most common benefits of MW irradiation are: 1) very rapid reactions, frequently a few minutes, brought about by high and uniform temperatures and combined with pressure effects, 2) higher degree of purity achieved due to short residence time at high temperatures, 3) yields often better, obtained within shorter times and with purer products [17]
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