Jorge Daniel Perez

Fvp of bis- and tris-(pyrazol-1-yl)methane. A radical reaction

Abstract Flash vacuum pyrolysis of bis- and tris-(pyrazol-1-yl) methane was carried out. Alpha, gamma and radical eliminations were considered. The products actually formed correspond to a radical reaction. In the case of bis-(pyrazol-1-yl) methane, working at higher temperatures, pyrimidine was obtained. This compound is formed by rearrangement of a PzCH2 radical.

Flash vacuum pyrolysis of 1-benzoylpyrazole

Abstract Flash vacuum pyrolysis reactions of 1-benzoylpyrazole were carried out between 600 and 720°C with contact times of 10 −2 to 10 −1 s. The analysis of the reaction products afforded 2-phenylfuran arising from an elimination reaction, two nitrile isomers and other products from a radical cleavage of 1-benzoylpyrazole. The different reaction mechanisms leading to these products are discussed.

Flash vacuum pyrolysis of 2-alkoxyiminated alkyl α-pyrone and 1,3-diazine derivatives

Abstract Flash vacuum pyrolysis of 6-ethyl-3-(1-ethoxyiminopropyl)-4-hydroxy-2H-pyrane-2-one (1) and 1,3-dimethyl-5-(1-ethoxyiminopropyl)-6-hydroxy-1,2,3,4-tetrahydropyrimidine-2,4-dione (2) were studied between 300 and 400°C, with nitrogen as the carrier gas. Compound 1 afforded a 1-azirine and the isomeric oxazole, while an oxime and an amide were the reaction products of 2. The difference in reactivity is discussed in terms of the tautomeric structures present in both compounds.

Azirines from the flash vacuum pyrolysis of oximes

Abstract Flash vacuum pyrolysis of a 2-alkoxyiminated-alkyl and a 2-alkoxyiminated-aryl cyclohexane-1, 3-dione derivative was carried out. In these reactions isoxazoles as well as isomeric oxazoles and azirines were found. Two reaction mechanisms involving an iminyl radical and an α elimination are discussed.