L-alkyl-3-methylimidazolium RMIM

This chapter will concentrate on the preparation of ionic liquids based on 1,3-dialkylimidazolium cations, as these have dominated the area over the last twenty years. The techniques discussed in this chapter are, however, generally applicable to the other classes of cations indicated in Fig. 2.1-1. The original decision by Wilkes et al. to prepare l-alkyl-3-methylimidazolium ([RMIM]+) salts was prompted by the requirement for a cation that had more negative reduction potential than Al(iii) [6]. The discovery that the imidazolium-based salts also generally displayed lower melting points than the 1-alkylpyridinium salts used prior to this cemented their position as the cations of choice since this time. Indeed, the method reported by... 

RTIL, l-aUcyl-3-methylimidazolium fluorohydrogenate, RMIm(HF)2.3F (R = n-alkyl group), is prepared by metathesis of starting chloride and anhydrous hydrogen fluoride ... 

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