[F:1][B-:2]([F:5])([F:4])[F:3].[CH3:6][O+](C)C.[CH2:10]([N:14]1[CH:18]=[CH:17][N:16]=[CH:15]1)[CH2:11][CH2:12][CH3:13]>ClCCCl>[F:1][B-:2]([F:5])([F:4])[F:3].[CH3:6][N+:16]1[CH:17]=[CH:18][N:14]([CH2:10][CH2:11][CH2:12][CH3:13])[CH:15]=1The procedure of Example 2 was followed. 3 g of trimethyloxonium tetrafluoroborate in suspension in 10 ml of 1,2-dichloroethane was added to 2.7 ml of N-butylimidazole in 10 ml of 1,2-dichloroethane. The mixture was stirred for 4 hours at room temperature. The remaining solvent was evaporated off under vacuum using a vane pump. A colorless liquid was obtained.
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