[F:1][B-:2]([F:5])([F:4])[F:3].[CH3:6][O+](C)C.[CH3:10][C:11]1[CH:16]=[C:15]([CH3:17])[N:14]=[C:13]([CH:18]=[CH2:19])[CH:12]=1>C(Cl)Cl>[F:1][B-:2]([F:5])([F:4])[F:3].[CH3:6][N+:14]1[C:15]([CH3:17])=[CH:16][C:11]([CH3:10])=[CH:12][C:13]=1[CH:18]=[CH2:19]Trimethyloxonium tetrafluoroborate (0.50 g; 3.76×10-3 mol) is added in one portion to a solution of 4,6-dimethyl-2-vinylpyridine (0.61 g; 4.13×10-3 mol) in 4.0 ml of methylene chloride under an inert atmosphere. The suspension is left to react for 2 h at 25° C. The suspension is filtered and the product is dried under vacuum. Yield=0.162 g (18%), white crystals.
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