[CH3:1][O:2][CH2:3][C:4]1[CH:9]=[CH:8][N:7]=[CH:6][CH:5]=1.[CH3:10][I:11]>C(#N)C>[I-:11].[CH3:1][O:2][CH2:3][C:4]1[CH:9]=[CH:8][N+:7]([CH3:10])=[CH:6][CH:5]=1A solution of 4.8 g (0.039 mol) of 4-methoxymethyl-pyridine in 25 ml of acetonitrile is mixed with 6.6 g (0.047 mol) of methyl iodide and stirred for 5 hours at ambient temperature. Then the partially precipitated quaternary salt is precipitated by the addition of ethyl acetate. 9.1 g (88% of theory) of 4-methoxymethyl-1-methyl-pyridinium iodide are obtained, m.p. 105°-108° C.
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