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Changes in Tautomeric Form Brought About by Electronegative Substituents

Changes in Tautomeric Form Brought About by Eiectronegative Substituents [Pg.7]

The exception is 3(5)-substituted 4-pyridones, to which Eq. (1.7) appHes. Katritzky and coworkers [20] have drawn attention to the extreme shallowness of this response, which could be due to the symmetrical positioning of R /R between [Pg.7]

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Electronegative substituent

Electronegative substituents

Form change

In tautomerism

Substituent changes

Tautomeric forms