Behavior of pyridinium salts obtained from derivatives of pyridinedicarboxylic acids in basic solutions. Addition of hydroxide or alkoxide to form 1, 2-dihydropyridine …
JC Speelman, RM Kellogg
文献索引：Speelman, Johanna C.; Kellogg, Richard M. Journal of Organic Chemistry, 1990 , vol. 55, # 2 p. 647 - 653
The N-alkylated pyridinium salts obtained from the diethyl esters, N-ethyl amides, and N, N- diethyl amides of pyridine-3, 5-dicarboxylic acid exhibit ultraviolet absorptions of moderate intensity in the region of 350 nm when dissolved in 95% ethanol. This absorption increases in intensity on addition of base and disappears on acidification of the solutions. It is not observed in rigorously dried solvents like chloroform or methylene chloride. By 'H NMR ...
