4-Cyanopyridobenzazolium and 1-cyanoquinolizinium salts from protonated 2-cyanomethylazaheterocycles and β-diketones
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2-Cyanomethyl-1-methylbenzimidazolium, 2-cyanomethylbenzothiazolium, 2-cyanomethylbenzoxazolium, and 2-cyanomethylpyridinium perchlorates react with β-diketones to give the corresponding 4-cyanopyridobenzazolium and 1-cyanoquinolizinium salts, which give polymethine dyes through the methyl groups in the α and γ positions of the pyridine ring.
KeywordsMethyl Organic Chemistry Pyridine Perchlorate Pyridine Ring
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