TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (A1) involves at least one N-substitution of piperidine compound of formula (II). Preferred Liquid: The ionic liquid (A1) further comprises an anion X- selected from bis(trifluoromethylsulfonyl)imide; dicyanamide; hexahalophosphates; tetrahaloborates; halides; nitrates; sulfates; phosphates; carbonates; sulfonates; carboxylates and silicates (preferably bis(trifluoromethylsulfonyl)imide, dicyanamide, trifluoromethylsulfonate or trifluoroacetate, especially bis(trifluoromethylsulfonyl)imide). Preferred Compound: The compound (II) is a by-product of the manufacture of 1,6-hexanediamine or 2-methyl-1,5-pentanediamine. Preferred Definitions:    R2=group of formula -(CH2)2OMe or -(CH2)2O(CH2)2OMe;    R1=methyl;    n=2;and    R3=H.    SPECIFIC COMPOUNDS - 4 Compounds are specifically claimed as the ionic liquid (A1) i.e. 1-(2-methoxyethyl)-1-methyl-azepanium bis(trifluoromethylsulfonyl)imide (IA); 1-(2-(2-methoxy-ethoxy)ethyl)-1-methyl-azepanium bis(trifluoromethylsulfonyl)imide; 1-(2-methoxyethyl)-1,3-dimethylpiperidinium bis(trifluoromethylsulfonyl)imide; and 1-(2-(2-methoxyethoxy)ethyl)-1,3-dimethylpiperidinium bis(trifluoromethylsulfonyl)imide.    EXAMPLE - To a stirring solution of azepane (10.7 g) in methanol (50 cm3) cooled in an ice-water bath, was added 1-bromo-2-methoxyethane (15 g) and potassium carbonate (15 g). The mixture was stirred at room temperature for 24 hours. After distillation in vacuum (42-44 degrees C, 1.0 mmHg), 1-methoxyethylazepane as colorless liquid (72% yield) was obtained. A slight excess of methyl iodide was added to 1-methoxyethylazepane in dichloromethane keeping the temperature below 20 degrees C by an ice-water bath. The reaction mixture was allowed to warm to room temperature and stirred until complete conversion of amine. Diethyl ether was added to the reaction mixture. After work-up, 1-(2-methoxyethyl)-1-methyl-azepanium iodide was obtained as a white solid. A slight excess of lithium bis (trifluoromethylsulfonyl) imide dissolved in water was added to an aqueous solution of 1-(2-methoxyethyl)-1-methyl-azepanium iodide and stirred at room temperature for approximately 5 hours. After work-up, 1-(2-methoxyethyl)-1-methyl-azepanium bistriflimide was obtained as a pale yellow liquid. The ionic liquid shows a viscosity at 25 degrees C of 134cP, and a melting point of -75 degrees C.