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The quaternisation of 2‐(methylpyridyl or quinolyl)benzimidazoles with methyl iodide leads to a variety of salts depending on the relative position of the nuclei and on the experimental conditions: N ‐methylpyridinium, N ‐methylquinolinium, methyl and 1,3‐dimethylbenzimidazolium iodides, and hydroiodides were isolated. Cyanine dyes were prepared from N ‐methylpyridinium and N ‐methylquinolinium methiodides. The main spectrospcopic features of these compounds are briefly discussed.
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Barni et al. (1979) studied this question.
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