The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Simple pyrimidines. VII. The fine structure of 4,6-dihydroxypyrimidine》. Authors are Brown, D. J.; Teitei, T..The article about the compound:6-Hydroxy-2-methylpyrimidin-4(3H)-onecas:1194-22-5,SMILESS:CC1=NC(=CC(N1)=O)O).Product Details of 1194-22-5. Through the article, more information about this compound (cas:1194-22-5) is conveyed.
cf. CA 59, 11490g. The ultraviolet spectrum of 4,6-dihydroxypyrimidine was compared with those of N-, O-, and 5-alkylated derivatives of fixed structures corresponding to possible tautomeric forms. Ultraviolet spectra in aqueous buffer of neutral mols. of 5,5-diethyl-1,4,5,6-tetrahydro-1,2-dimethyl-4,6-dioxopyrimidine, 4,6-dihydroxypyrimidine, 1,6-dihydro-4-methoxy-1-methyl-6- oxopyrimidine, 4,6-dimethoxypyrimidine, and 1,4-dihydro-6-methoxy-1-methyl-4-oxopyrimidine and ultraviolet spectra in alc. of 4,6-dihydroxy-5-methylpyrimidine, 4,6-dihydroxy-5-isopropylpyrimidine, 4,6-dihydroxy-2-n-propylpyrimidine, and 4,6-dihydroxypyrimidine were determined An aqueous solution consisted essentially of 1,4,5,6-tetrahydro-4,6-dioxopyrimidine in equilibrium with a smaller amount of 1,4-dihydro-6-hydroxy-4-oxopyrimidine. The existence of the active 5-methylene grouping within the ring was confirmed chem. by a ready condensation of benzaldehyde with the pyrimidine in aqueous solution
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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem