Separation and identification by gas chromatography and gas chromatography-mass spectrometry of the nitrogen compounds from a deasphalted heavy oil. Evolution of their distribution after a catalytic hydrotreatment was written by Ignatiadis, I.;Schmitter, J. M.;Arpino, P.. And the article was included in Journal of Chromatography in 1985.Application of 644-98-4 This article mentions the following:
Basic and neutral N fractions were selectively isolated from a deasphalted heavy crude oil and were characterized by gas chromatog. and gas chromatog. mass spectrometry. Most chromatog. peaks were identified. Basic substances included C5-10-alkylpyridines, C1-9-alkylquinolines, and C1-4-alkylbenzoquinolines; neutral fractions comprised C1-4-alkylcarbazoles and C1-4-alkylbenzocarbazoles. Only a few specific structures were isolated compared to the large total number of possible isomers. Pseudo-homologous series were recognized, a noticeable example being 8-isopropylalkylquinoline. These results were compared to the distribution of N substances from this sample after catalytic hydrotratment. Alkylpyridines totally disappeared, whereas C1-7-alkylanilines were found. Identification of specific pseudo-homologous series of N substances in the hydrotreated sample confirm previous results on the resistance to hydrogenation of carbazoles and azaarenes bearing a Me substituent in α position to the N atom. In the experiment, the researchers used many compounds, for example, 2-Isopropylpyridine (cas: 644-98-4Application of 644-98-4).
2-Isopropylpyridine (cas: 644-98-4) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Application of 644-98-4