Yield: 78%

Reaction Conditions:

in ethanol at 20; for 16 h;

Steps:

Lithium bis(trifluoromethanesulfonyl)imide (10.77 g, 37.51 mmol) was added to a flask containingtetradecyltrihexylphosphonium chloride (19.48 g, 37.51 mmol), then dissolved in ethanol (95%, 40 mL).The reaction mixture was stirred for 16 h at ambient temperature. Volatiles were removed in vacuo andthe resulting oil was dissolved in CH2Cl2 (50 mL) and washed with five aliquots of distilled water (50mL). The organic layer was dried over anhydrous Na2SO4 and the volatiles were removed in vacuo toafford tetradecyltrihexylphosphonium bis(trifluoromethanesulfonyl)imide (22.30 g, 78%) as a pale yellowoil.

References:

Keith, Adam J.;Kosik, Stephen D.;Tillekeratne, L. M. Viranga;Mason, Mark R. [Synlett,2014,vol. 25,# 7,art. no. 5350,p. 977 - 982] Location in patent:supporting information