Abstract
Heating 3, 4-dimethyl-5-aminoisoxazole at around 180° results in intramolecular rearrangement to form its isomer, 4, 5-dimethylimidazolone (2). Presence of aniline or toluidine in this instance results in the partial formation of diphenyl- or ditolyl-urea. The same treatment of 3-methyl-4-ethyl- and 3-ethyl-4-methyl-5-aminoisoxazole yielded identical 4, 5-dimethylimidazolone (2) by intramolecular rearrangement.
