A complete analysis of a crude oil C-2-carbazole fraction by H-1 NMR spectroscopy

Citation
Mb. Smirnov et Eb. Frolov, A complete analysis of a crude oil C-2-carbazole fraction by H-1 NMR spectroscopy, ORG GEOCHEM, 29(5-7), 1998, pp. 1091-1099
Citations number
21
Categorie Soggetti
Earth Sciences
Journal title
ORGANIC GEOCHEMISTRY
ISSN journal
01466380 → ACNP
Volume
29
Issue
5-7
Year of publication
1998
Pages
1091 - 1099
Database
ISI
SICI code
0146-6380(1998)29:5-7<1091:ACAOAC>2.0.ZU;2-1
Abstract
A new approach for a complete analysis of petroleum C-2 carbazoles has been developed. C-2 carbazole subfraction isolated from crude oil using liquid chromatography on silica gel and preparative reverse-phase HPLC, was invest igated by proton nuclear magnetic resonance spectroscopy and gas chromatogr aphy. As an example, the analysis of C-2 carbazoles from the Van-Yagansk oi l (Upper Jurassic, West Siberia province) is reported. The isolated subfrac tion included all C-2 carbazoles and also a part of some of the least retai nable C-3 carbazoles. Dimethylcarbazoles have been determined in the C-2 su bfraction as the predominant type of isomers. Ethyl-, i-propyl-. methylethy l- and n-propylcarbazoles were determined in low abundances. Distribution o f 1-, 2- and 3- (jointly), 4-ethylcarbazoles was determined. All the dimeth ylcarbazoles were determined in the oil, with the content of 4,5-dimethylca rbazole being negligible. (C) 1998 Elsevier Science Ltd. All rights reserve d.