Thermal behaviour of nitrogen oxides relevant to oxidative denitrogenation was written by Mirshamsi, Sepideh;Yan, Yuwei;Kamal, Sidra;Yasemi, Amir-Arsalan;Gupta, Rajender;de Klerk, Arno;Prado, Glaucia H. C.. And the article was included in Journal of Chemical Thermodynamics in 2019.Formula: C7H9NO This article mentions the following:
Oxidative denitrogenation is an alternative method to hydro-treating, where the nitrogen compounds are oxidized to form nitrogen oxides, which can be separated from the oil by extraction with a polar solvent. During this separation process there is a loss of hydrocarbon material which can be between (10-20) wt% for an oil containing 1 wt% of N. The possibility to release nitrogen as NOx by thermal treatment and consequently recover the hydrocarbon portion from the N-oxide mol. is the topic explored in this work. The thermochem. of the N-oxides of pyridine, 3-picoline, 2-mercaptopyridine, quinoline, 4-nitropyridine, 3,5-dimethylpyridine, picolinic acid, 4-picoline, 3-hydroxypyridine, nicotinic acid, isonicotinic acid, and nicotinamide was studied. The results showed that the N-oxides of pyridine and 3-picoline evaporated at atm. pressure while the other compounds decomposed after or during melting or during evaporation Decomposition temperatures could be determined for all the N-oxides during thermal anal. at 5 MPa gauge. Infra-red spectroscopy of the residues after thermal treatment indicated that the compounds still contained nitrogen. The suggested chem. taking place upon thermal decomposition in the liquid phase was discussed. N-oxides may form an oxaziridine intermediate, which results in formation of polymeric structures that still contain the nitrogen. Therefore, pyrolysis of the N-oxides subsequent to oxidation seems to be inefficient to liberate the nitrogen as NOx. In the experiment, the researchers used many compounds, for example, 3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8Formula: C7H9NO).
3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8) belongs to pyridine derivatives. Pyridine’s the lone pair does not contribute to the aromatic system but importantly influences the chemical properties of pyridine, as it easily supports bond formation via an electrophilic attack. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Formula: C7H9NO