Quality Control of 4-Hydroxypicolinic acid. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 4-Hydroxypicolinic acid, is researched, Molecular C6H5NO3, CAS is 22468-26-4, about A hydroxypipecolic acid from thrift (Armeria maritima). Author is Fowden, L..
A hydroxypipecolic acid has been isolated from thrift and shown to be identical with a substance isolated from Acacia by Virtanen and Kari (C.A. 50, 4943e), who provisionally characterized it as 4-hydroxypipecolic acid (I). I has been synthesized by catalytic hydrogenation of 4-hydroxypicolinic acid with H and PtO. 3-Hydroxypipecolic acid was also synthesized in a like manner from 3-hydroxypicolinic acid. Oxidation of the 4- and 3-isomers yielded β-alanine, glycine, and aspartic acids and β-alanine, glycine, γ-aminobutyric, and aspartic acids, resp. Comparisons with synthetic 4- and 3-isomers indicated that the isolated imino acid may be the 3-isomer. Strictly identical behavior of natural and synthetic 3-isomer could not be demonstrated since the 2 substances differed in stereoisomeric composition
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