Investigation of Thermolysis Products of Some N-Arylthiophene-2-carboxamidoximes by Analytical and Spectroscopic Analyses

N-arylthiophene-2-carboxamidoxime derivatives (a-e) were synthesized by using two methods and then subjected to thermolysis at 200–250 °C for 2 h under nitrogen atmosphere either alone or in the presence of tetralin and/or naphthalene as radical scavengers yielded imidazole, oxazole, triazine and amide derivatives. The pyrolysates from both reactions were separated with their constituents by column chromatography and analyzed then identified ¹H NMR, ¹³C NMR and GC-MS. A plausible mechanism is suggested through two competitive pathways involving the homolysis of N-O and/or C-N bonds to account for the thermolysis products.