The title betaines react at the 2- and 6-positions with 2π addends and at the 2- and 4-positions with 4π addends. Adducts from the 2π addends are transformed into aryl-substituted tropones via methylation and Hofmann elimination.
N. Dennis, A. R. Katritzky and R. Rittner, J. Chem. Soc., Perkin Trans. 1, 1976, 2329 DOI: 10.1039/P19760002329
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