Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 27828-71-3, is researched, Molecular C6H5NO3, about Acid-base reactions of β-hydroxypyridinecarboxylic acids, the main research direction is pyridinecarboxylate hydroxy ionization protonation; ionization hydroxypyridinecarboxylate; protonation hydroxypyridinecarboxylate; tautomerism hydroxypyridinecarboxylate.Application of 27828-71-3.
The protonation and ionization constants of 5-hydroxynicotinic and -picolinic and 3-hydroxyisonicotinic acids and their Et esters were determined In strongly acidic media these acids are protonated; as the pH is increased, they exist 1st as the bipolar ions (e.g., I), then as tautomeric monoanions, and finally as the dianions. The pH limits of these forms were determined for the 3 acids.
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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method