Di-cationic ionic liquids (DCILs) enhanced the reactivity of KF efficiently.
hexaEG-DHIM and hexaEG-DtOHIM DCILs were used as catalysts for SN2 fluorination.
KF/hexaEG-DHIM/t-alcohol combination showed excellent selectivity in the fluorination.
Tailor-made DCILs were well-designed for nucleophilic fluorination.