I-Methyl-2-pyridone

The similarity of their rate profiles, and the similarity of their rate constants for nitration at a particular temperature and acidity show that 4-pyridone, i-methyl-4-pyridone, and 4-methoxypyridine are all nitrated as their cations down to about 85 % sulphuric acid. The same is true of 2-methoxy-3-methylpyridine. In contrast, 3- and 5-methyl-2-pyridone, i,5-dimethyl-2-pyridone and 3-nitro-4-pyridone all react... 

A comparison of the infrared spectra of 4-pyridone and l-methyl-4-pyridone in the solid states shows that the bands at 1635 cm" are not much different but that the 1534 cm" band of 4-pyridone is shifted to near 1550 cm" and sharpens in l-methyl-4-pyridone, consistent with the expected shift from a hydrogen bonded to a nonhydrogen bonded carbonyl. However, a comparison of the spectra of 3,5-dihalo-, 3,5-dihalo-l-methyl-, 2,3,5,6-d, l-d-, and I-methyl-4-pyridones has led to the conclusion that both C=0 and C=C stretchings are extensively mixed to give composite vibrations at both frequencies. These difficulties have not negated the earlier structure assignments of 4-pyridones that have been based on infrared interpretations. 

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See also in sourсe #XX -- [ ]

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