Syntheses with aromatic nitramines. VI. Substituent effect in the photolytic rearrangement of nitraminopyridines was written by Sepiol, Jadwiga;Tomasik, Piotr. And the article was included in Acta Chimica Hungarica in 1986.Synthetic Route of C5H3Br2NO This article mentions the following:
Isomeric 2-nitraminopyridines I (R = 3-Me, 4-Me, 5-Me, 6-Me, 3-NO2, 5-NO2, 5-Cl, 3-CO2H) as well as 3,5-dibromo-2-nitraminopyridine (II, R1 = NO2) rearranged on irradiation with a low pressure Hg lamp (253.7 nm) in MeOH. Preference was generally noted for the migration of the side-chain NO2 group to the vicinal β-position. II (R1 = NO2) gave both II (R1 = H) and the pyridone III. The ratio of the preparative and quantum yields of the two products were 2.5 and 3.0, resp. In the experiment, the researchers used many compounds, for example, 3,5-Dibromo-2-hydroxypyridine (cas: 13472-81-6Synthetic Route of C5H3Br2NO).
3,5-Dibromo-2-hydroxypyridine (cas: 13472-81-6) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of −48.7 × 10−6 cm3·mol−1.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·mol−1 in the liquid phase and 140.4 kJ·mol−1 in the gas phase. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Synthetic Route of C5H3Br2NO