1,3-Dipolar character of six-membered aromatic rings. Part XXV. 5-Aryl-1-methyl-3-oxidopyridiniums

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Abstract
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.