Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 6-Hydroxy-2-methylpyrimidin-4(3H)-one, is researched, Molecular C5H6N2O2, CAS is 1194-22-5, about Kinetic and spectral investigation of the electron and hydrogen adducts of dihydroxy- and dimethyl-substituted pyrimidines: A pulse radiolysis and product analysis study.COA of Formula: C5H6N2O2.
The reactions of hydrated electrons (eaq-) and hydrogen atoms (H•) with 4,6-dihydroxy-2-methylpyrimidine (DHMP), 2,4-dimethyl-6-hydroxypyrimidine (DMHP), 5,6-dimethyluracil (DMU) and 6-methyluracil (MU) were studied at different pH values using pulse radiolysis. The second-order rate constants obtained for the reaction of eaq- with these systems are in the range (5-10) × 109 dm3 mol-1 s-1 at near, neutral pH. At basic pH, the rate constant values were considerably reduced owing to the electrostatic effect between eaq- and pyrimidine anion. The transient absorption spectra of the electron adducts have distinct absorption maxima at around 300-320 nm. The initial spectrum in the case of DHMP at pH 4.5 was found to undergo a first-order transformation. Based on the spectral characteristics and the yields of methylviologen radical cation (MV.+) resulted from the electron transfer reaction between the electron adducts and MV2+, it is proposed that a protonated (at oxygen) electron adduct of DHMP is initially formed which undergoes a proton- and phosphate-catalyzed transformation to form a reducing C(5) protonated C(6)-yl radical. Such preferential protonation at C(5) is predominant only with dihydroxypyrimidine systems. At pH 9 and 13, formation of a radical monoanion of DHMP (pKa ≥ 13) is proposed. The possible attack of eaq- is proposed to be at N(1) or N(3) of DMHP. The resulting electron adduct has a pKa value around 6.0. Similar properties for the electron adducts of DMU and MU [electron attack at O(4)] are proposed. The second-order rate constants for H. with DHMP, DMHP, DMU and MU were in the range (1.7-28) × 108 dm3 mol-1 s-1. The hydrogen adduct spectra were generally identified as their absorption maxima at 310-380 and 460-510 nm. Formation of C(5)-protonated C(6)-yl radical, the same radical that formed after the H+-and phosphate-catalyzed transformation of the electron adduct, is proposed for DHMP. The possibility of the formation of C(5)-yl and C(6)-yl H adducts of DMHP, DMU and MU is discussed. High-performance liquid chromatog. coupled with electrospray mass spectrometry (HPLC-ES-MS) has been used to qual. analyze the products obtained from the reaction of eaq- with DHMP and DMHP and the results revealed that the products are mainly derived from the C(5) protonated C(6)-yl radicals via its disproportionation and dimerization reaction. A possible reaction mechanism is proposed for the product formation.
Compound(1194-22-5)COA of Formula: C5H6N2O2 received a lot of attention, and I have introduced some compounds in other articles, similar to this compound(6-Hydroxy-2-methylpyrimidin-4(3H)-one), if you are interested, you can check out my other related articles.
Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem