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: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Electronic spectra and structure of methyl derivatives of 4-nitropyridine N-oxide.COA of Formula: C7H8N2O3.
The UV spectra of seven Me derivatives of 4-nitropyridine N-oxide in ethanol have been examined The electronic spectra were calculated by a modified INDO method. Transition energies, intensities and assignments were compared with UV spectra. Spectroscopic manifestations of intramol. interaction indicate that Me groups modify the electronic interaction between the N-oxide and NO2 groups mainly through a steric strain.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem