TY  - JOUR
AU  - Vitorović, Dragomir K.
AU  - Dragojlović, Veljko
PY  - 1990
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4734
AB  - Molecular models of considerable complexity have been proposed recently for type I, II and III kerogens. Here, we describe the amount and type of carboxylic acids that one would expect to result from their multistep alkaline permanganate oxidation, based on literature data for the oxidation of a range of kerogens. This exercise was aimed at providing useful data for the possible improvement of the proposed models. Discrepancies arise between the products of the oxidation of isolated kerogens, as obtained in practice, and those expected from the oxidation of the three model kerogens. These are, principally, that the models do not allow for the appearance of aliphatic monocarboxylic, isoprenoid and alkyl-substituted aromatic acids, there are discrepant distributions, or proportions, of α,ω-dicarboxylic, aromatic and phenolic, and alkane-carboxylic or cycloalkanoic acids in the model oxidation products. The presence of more easily and completely degradable structural units in the kerogen models are also anomalous.
PB  - Elsevier
T2  - Organic Geochemistry
T1  - Test of the validity of some kerogen models based on oxidative degradation
VL  - 15
IS  - 3
SP  - 313
EP  - 319
DO  - 10.1016/0146-6380(90)90009-O
ER  - 

@article{
author = "Vitorović, Dragomir K. and Dragojlović, Veljko",
year = "1990",
abstract = "Molecular models of considerable complexity have been proposed recently for type I, II and III kerogens. Here, we describe the amount and type of carboxylic acids that one would expect to result from their multistep alkaline permanganate oxidation, based on literature data for the oxidation of a range of kerogens. This exercise was aimed at providing useful data for the possible improvement of the proposed models. Discrepancies arise between the products of the oxidation of isolated kerogens, as obtained in practice, and those expected from the oxidation of the three model kerogens. These are, principally, that the models do not allow for the appearance of aliphatic monocarboxylic, isoprenoid and alkyl-substituted aromatic acids, there are discrepant distributions, or proportions, of α,ω-dicarboxylic, aromatic and phenolic, and alkane-carboxylic or cycloalkanoic acids in the model oxidation products. The presence of more easily and completely degradable structural units in the kerogen models are also anomalous.",
publisher = "Elsevier",
journal = "Organic Geochemistry",
title = "Test of the validity of some kerogen models based on oxidative degradation",
volume = "15",
number = "3",
pages = "313-319",
doi = "10.1016/0146-6380(90)90009-O"
}

Vitorović, D. K.,& Dragojlović, V.. (1990). Test of the validity of some kerogen models based on oxidative degradation. in Organic Geochemistry
Elsevier., 15(3), 313-319.
https://doi.org/10.1016/0146-6380(90)90009-O

Vitorović DK, Dragojlović V. Test of the validity of some kerogen models based on oxidative degradation. in Organic Geochemistry. 1990;15(3):313-319.
doi:10.1016/0146-6380(90)90009-O .

Vitorović, Dragomir K., Dragojlović, Veljko, "Test of the validity of some kerogen models based on oxidative degradation" in Organic Geochemistry, 15, no. 3 (1990):313-319,
https://doi.org/10.1016/0146-6380(90)90009-O . .

TY  - JOUR
AU  - Vitorović, Dragomir K.
AU  - Krsmanović, V. D.
AU  - Pfendt, Petar A.
PY  - 1980
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4408
AB  - Two oxidizing agents were used for structural studies of the kerogen from Aleksinac shale (Yugoslavia), namely: (1) alkaline potassium permanganate, and (2) acidic ferric chloride. (1) The main goal with alkaline permanganate was to obtain optimum yields of identifiable oxidation products with preserved kerogen structural characteristics. In order to find optimal conditions, experiments were carried out at various temperatures (20-100°C) with varying amounts of permanganate per step. The best total yield of isolable degradation products (92,25%) was obtained at 75°C. At the same reaction temperature the best yield of ether-soluble acids was obtained (39% of the total organic matter). Kerogen degradation products obtained in high yields provide a better basis for more reliable structural interpretations than the products obtained in minor yields, which may represent small undefined portions of the original kerogen. (2) Ferric chloride is an oxidant of relatively high oxidation potential, although it is more gentle and more specific (e.g., dehydrogenation and decarboxylation) than most oxidation reagents containing oxygen used in kerogen structural studies. In oxidation of the Aleksinac shale kerogen concentrate with acidic ferric chloride solution, the pyrite content decreased (38-75%), and the kerogen content increased (7-15%). A small portion of the kerogen (∼8%) was degraded into soluble products. The chemical nature of the kerogen was considerably changed. In addition to a decrease in the atomic H C ratio and an increase in the O C ratio, changes in the content of aliphatic, aromatic, carbonyl and quinoid structures were observed.
PB  - Elsevier
T2  - Physics and Chemistry of the Earth
T1  - Kerogen structural studies-oxidations with alkaline permanganate and with ferric chloride
VL  - 12
IS  - C
SP  - 585
EP  - 589
DO  - 10.1016/0079-1946(79)90140-X
ER  - 

@article{
author = "Vitorović, Dragomir K. and Krsmanović, V. D. and Pfendt, Petar A.",
year = "1980",
abstract = "Two oxidizing agents were used for structural studies of the kerogen from Aleksinac shale (Yugoslavia), namely: (1) alkaline potassium permanganate, and (2) acidic ferric chloride. (1) The main goal with alkaline permanganate was to obtain optimum yields of identifiable oxidation products with preserved kerogen structural characteristics. In order to find optimal conditions, experiments were carried out at various temperatures (20-100°C) with varying amounts of permanganate per step. The best total yield of isolable degradation products (92,25%) was obtained at 75°C. At the same reaction temperature the best yield of ether-soluble acids was obtained (39% of the total organic matter). Kerogen degradation products obtained in high yields provide a better basis for more reliable structural interpretations than the products obtained in minor yields, which may represent small undefined portions of the original kerogen. (2) Ferric chloride is an oxidant of relatively high oxidation potential, although it is more gentle and more specific (e.g., dehydrogenation and decarboxylation) than most oxidation reagents containing oxygen used in kerogen structural studies. In oxidation of the Aleksinac shale kerogen concentrate with acidic ferric chloride solution, the pyrite content decreased (38-75%), and the kerogen content increased (7-15%). A small portion of the kerogen (∼8%) was degraded into soluble products. The chemical nature of the kerogen was considerably changed. In addition to a decrease in the atomic H C ratio and an increase in the O C ratio, changes in the content of aliphatic, aromatic, carbonyl and quinoid structures were observed.",
publisher = "Elsevier",
journal = "Physics and Chemistry of the Earth",
title = "Kerogen structural studies-oxidations with alkaline permanganate and with ferric chloride",
volume = "12",
number = "C",
pages = "585-589",
doi = "10.1016/0079-1946(79)90140-X"
}

Vitorović, D. K., Krsmanović, V. D.,& Pfendt, P. A.. (1980). Kerogen structural studies-oxidations with alkaline permanganate and with ferric chloride. in Physics and Chemistry of the Earth
Elsevier., 12(C), 585-589.
https://doi.org/10.1016/0079-1946(79)90140-X

Vitorović DK, Krsmanović VD, Pfendt PA. Kerogen structural studies-oxidations with alkaline permanganate and with ferric chloride. in Physics and Chemistry of the Earth. 1980;12(C):585-589.
doi:10.1016/0079-1946(79)90140-X .

Vitorović, Dragomir K., Krsmanović, V. D., Pfendt, Petar A., "Kerogen structural studies-oxidations with alkaline permanganate and with ferric chloride" in Physics and Chemistry of the Earth, 12, no. C (1980):585-589,
https://doi.org/10.1016/0079-1946(79)90140-X . .