In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Potentiometric studies of acid-base interactions in substituted 4-nitropyridine N-oxide systems, published in 2006-05-31, which mentions a compound: 14248-66-9, mainly applied to nitropyridine oxide derivative acid base equilibrium constant polar solvent, Formula: C7H8N2O3.
(Acid + base) equilibrium constants, involving the acidity (pKACa) and cationic homoconjugation constants (in the form of lg KANBHB+), have been determined by the potentiometric method in 13 systems formed by substituted 4-nitropyridine N-oxides in the polar aprotic solvent, acetone (AC). The derivatives covered a wide range of proton-acceptor properties and inherent diversified tendencies towards formation of hydrogen-bonded cations. In addition, the constant values (expressed as pKANa and lg KANBHB+) for two of the systems studied, N-oxides of 2-methylamino- and 2-ethylamino-4-nitropyridine, were determined in acetonitrile (AN). The acidity constants in the non-aqueous media studied have been found to change in line with their substituent effects and the sequence of acidity changes in water. The values of the cationic homoconjugation constants increased with increasing basicity of the N-oxides and decreased with increasing solvent basicity.
After consulting a lot of data, we found that this compound(14248-66-9)Formula: C7H8N2O3 can be used in many types of reactions. And in most cases, this compound has more advantages.
Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem