[N:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1.[CH3:11][I:12]>O1CCOCC1>[I-:12].[CH3:11][N+:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1N-methylquinolinium iodide (Compound III) was synthesized according to the description in the aforementioned reference. Specifically, 2.4 mL of quinoline and 4 mL of methyl iodide were added to 42 mL of anhydrous dioxane, which was stirred at 150° C. for one hour. Thereafter, it was filtered and thereby a precipitate was collected and then washed with ether and petroleum ether. This was dried and thus N-methylquinolinium iodide (Compound III) was obtained.
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