1-Methyl and 1-allyl-2,4,6-triphenylpyridinium cations react with aromatic aldehydes at the α-CH2 to give aldol products (7) and (8). The allyl adducts (8) were thermally converted into aldehydes and ketones, whereas thermolysis of (7) took a variety of courses. Zwitterions from 1-methylpyridinium cations were also added Michael-fashion to activated carbon–carbon double bonds.
A. R. Katritzky, O. Rubio, J. M. Aurrecoechea and R. C. Patel, J. Chem. Soc., Perkin Trans. 1, 1984, 941 DOI: 10.1039/P19840000941
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