Kinetic rates for cyclisation of divinylogous amides (derived from pyrylium cations and primary amines) into pyridinium cations are measured for CH2C2 solutions and compared with previous results in water and other solvents. The ring-closure is catalysed by carboxylic acids; a postulated mechanism involves the free acid in catalysis of electrocyclic ring closure.
A. R. Katritzky and D. E. Leahy, J. Chem. Soc., Perkin Trans. 2, 1985, 171 DOI: 10.1039/P29850000171
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