Imidazolium salts thioether

Figure 4.85 Synthesis of thioether functionalised imidazolium salts and their silver(l) and...

Figure 4.86 Synthesis of thioether functionalised imidazolium salts having a pyridofa] annu-...

Figure 4.90 Synthesis of a thioether functionalised imidazolium salt on a ferrocene scaffold.

In their pioneering work Davis and Rogers [84, 85] have reported the synthesis of imidazolium salts with urea, thiourea and thioether groups in one of the /V-alkyl substituents (Fig. 14). 

Fig. 14 Imidazolium salts with urea, thiourea and thioether groups...

The interest in functionalized ionic liquids is growing because ionic liquids bearing ether, amino or alcohol functionalities have been shown to display special properties, including the ability to dissolve a larger amoimt of metal halide salts and to extract heavy metal ions from aqueous solutions. Imidazolium-based ionic liquids with ether and hydroxyl (see Section 2.2.1), thiourea, thioether and urea (see Section 2.2.8) " have been prepared following the standard quatemization procedure. A straightforward approach has been described for the preparation of imidazolium (as well as pyridinium) cations with ester, ketone or cyanide functionalities 1-methylimidazole reacts with methanesulfonic acid to provide the imidazolium salt 11, which undergoes a Michael-type reaction with methyl vinyl ketone as a ,j8-unsaturated compound to produce the ionic liquid 12 (Scheme 5). ... 

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