The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Ultraviolet absorption spectra of pyridoxine and related compounds》. Authors are Lund, Agnes K.; Morton, R. A..The article about the compound:5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloridecas:148-51-6,SMILESS:OC1=C(C)C(CO)=CN=C1C.[H]Cl).Recommanded Product: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. Through the article, more information about this compound (cas:148-51-6) is conveyed.
The absorption spectra of pyridoxine and 7 related compounds were studied at different pH values. The results permit the calculation of pH values for 2- and 3-component systems and for some 4-component systems. The study illustrates the spectrophotometric analysis of complex systems and, in addition confirms the recently established structure of codecarboxase (pyridoxal phosphate). The study was undertaken to use the vitamin B6 problem to illustrate spectrophotometric methods applied to complex systems. 12 references.
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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia