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thiophene

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Journal Article
Published: 01 February 1987
Clays and Clay Minerals (1987) 35 (1): 53–59.
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DFT-calculated adsorption geometries for <b>thiophene</b> on stoichiometric nonhyd...
Published: 01 January 2006
Figure 21. DFT-calculated adsorption geometries for thiophene on stoichiometric nonhydrogenated RuS 2 (100) surface (left) and the reduced RuS 2 (100) surface (right). [Used with permission of The American Physical Society from Smelyansky et al. (1998) , Physical Review B , Vol. 58, Figs. 2
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Mass fragmentograms of 2-methyl-5- n -alkyl <b>thiophenes</b> ( m &#x2F; z  111). Aroma...
Published: 01 July 2009
Fig. 1. Mass fragmentograms of 2-methyl-5- n -alkyl thiophenes ( m / z 111). Aromatic fraction of: a , products of anhydrous pyrolysis of kerogen K-1/3/2; b , thermal bitumen produced on autoclaving of the oil shale Ib at 275 °C; c , products of flow pyrolysis of kerogen K-1/3/2 in high
Series: AAPG Studies in Geology, AAPG Studies in Geology
Published: 01 January 1987
DOI: 10/1306/St25468C11
EISBN: 9781629811406
...-alkanes, isoprenoids, light aromatics, and light thiophenes are completely removed, with a resultant concentration of naphthenes and heavy or highly branched aromatics and thiophenes. In the most severely degraded samples, steranes are partially removed. Diasteranes and triaromatic steranes, however...
Series: AAPG Studies in Geology, AAPG Studies in Geology
Published: 01 January 1984
DOI: 10.1306/St18443C13
EISBN: 9781629811642
... Abstract Several families of thiophenic organosulfur compounds (primarily benzo- and dibenzothiophenes) show promise for distinguishing oils derived from carbonate sources versus siliciclastic sources. This observation is based on analyses, using high-resolution gas chromatography coupled...
Journal Article
Journal: PALAIOS
Published: 03 February 2021
PALAIOS (2021) 36 (1): 1–14.
.... The chemical analysis yields 12 major sulfur compounds, mostly thiophenes, consistent with vulcanized rubber. The vulcanization of these laticifers most likely occurred during early diagenesis, before the degradation of the wood, at low temperatures, and may have been facilitated with other compounds...
FIGURES | View All (5)
Journal Article
Published: 01 June 1975
Bulletin of Canadian Petroleum Geology (1975) 23 (2): 278–294.
... rich in alkanes but has a similar naphthenic content to that of the rock extracts. It also contains thiophenic aromatic compounds present in the Cap Bon Ami extract. A Lower Devonian source may be suggested for the oil show on the basis of the above resemblance. Copyright © 1975, The Canadian Society...
Journal Article
Journal: AAPG Bulletin
Published: 01 November 1974
AAPG Bulletin (1974) 58 (11): 2338–2348.
... with relatively more thiophenes. At shallow depths, alteration produces crudes with more nonthiophenic sulfides and benzothiophenes. Another form of “altered” oils is adjacent to zones of organic metamorphism where H 2 S reacts with oils to produce extremely corrosive mercaptan-rich crudes and condensates...
FIGURES | View All (12)
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Mass fragmentogram of unfractionated pyrolysate of V-1/5/3 kerogen (97 + 98...
Published: 01 July 2009
Fig. 3. Mass fragmentogram of unfractionated pyrolysate of V-1/5/3 kerogen (97 + 98 + 111 + 112 fragmentary ions) showing the distribution of C2-substituted thiophenes. 2,5-DMT, 2,5-dimethyl thiophene; 2-ET, 2-ethyl thiophene; 2,4-DMT, 2,4-dimethyl thiophene; 2,3-DMT, 2,3-dimethyl thiophene.
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Mass chromatograms of homologue series and identified in the products of sa...
Published: 01 February 2017
Fig. 7. Mass chromatograms of homologue series and identified in the products of sapropels ooze flash pyrolysis: fatty acids ( a ), nitriles ( b ), amides ( c ), ketones ( d ), thiophenes ( e ). Mass chromatograms were constructed based on the sum of molecular ions ( a ), characteristic
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Structures of compounds identified; see  Table 3  for more information on e...
in > PALAIOS
Published: 03 February 2021
Fig. 5.— Structures of compounds identified; see Table 3 for more information on each compound. A ) Dimethyl disulfide. B ) 1,3,5-cycloheptatriene. C ) 2,4-dimethylthiophene. D ) 2,3-dimethylthiophene. E ) 2,7-dimethyl-1,7-octadiene. F ) 2-(1-methylethyl)-thiophene. G ) 2,3,4
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Results of the GC-MS analysis of volatile components extracted from fluid i...
Published: 01 November 2020
+ 71 + 85); c , m/z 60; d , m/z (97 + 98); e , blank. 1, Carbon dioxide (СО 2 ); 2, Water (H 2 O); 3, Acetaldehyde (C 2 H 4 O); 4, 2-Propanone (C 3 H 6 O); 5, Formic acid (CH 2 O 2 ); 6, Thiophene, 2-methyl- (C 5 H 6 S); 7, Thiophene, 3-methyl- (C 5 H 6 S); 8, Butanoic acid (C 4 H 8 O 2 ); 9
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Pyrolysis gas chromatography–derived compounds in determining (A) kerogen t...
Published: 15 November 2019
Figure 8. Pyrolysis gas chromatography–derived compounds in determining (A) kerogen typing according to the relative abundance of n-octene, m , p -xylene and phenol ( Larter, 1984 ) and (B) molecular structure of kerogen based on o -xylene, n-nonene, and 2,3-dimethyl (DM)-thiophene ( Eglinton
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Molecular packing in the idrialite ( Echigo  et al.  2009 ) schematically s...
Published: 01 December 2010
F ig . 14. Molecular packing in the idrialite ( Echigo et al. 2009 ) schematically shown as a mixed crystal of picene (C 22 H 14 ) and benzo-phenanthro-thiophene (C 20 H 12 S); the former is polycyclic aromatic hydrocarbon (PAH), and the latter is sulfur-bearing PAH (SPAH).
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Results of the GC-MS analysis of volatile components extracted from fluid i...
Published: 01 November 2020
+ 71 + 85); c , m/z 60; d , m/z (97 + 98); e , blank. 1, Carbon dioxide (СО 2 ); 2, Water (H 2 O); 3, Acetaldehyde (C 2 H 4 O); 4, Propane, 2-methyl- (C 4 H 10 ); 5, 2-Propanone (C 3 H 6 O); 6, Acetic acid (C 2 H 4 O 2 ); 7, Thiophene, 2-methyl- (C 5 H 6 S); 8, Thiophene, 3-methyl- (C 5 H 6 S); 9
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Lithological log of the Maikop Group and concentrations and ratios of selec...
Published: 01 March 2017
; M.Mi. = Middle Miocene; Polb. = Polbian Bed; Stratigr. = stratigraphic; thioph. = thiophenes; TOC = total organic carbon.
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Molecular structures of PAHs contained in idrialite from Skaggs Springs. Ap...
Published: 01 October 2009
F igure 1. Molecular structures of PAHs contained in idrialite from Skaggs Springs. Approximate abundance of their components ( Wise et al. 1986 ) is shown in square brackets: ( a ) picene [40%], ( b ) chrysene [7%], ( c ) benzo-phenanthro-thiophene [10%], ( d ) dibenzo-carbazole [trace], ( e
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Molecular structures of ( a ) picene (C 22 H 14 ), ( b ) indenofluorene (C ...
Published: 01 August 2007
F igure 9. Molecular structures of ( a ) picene (C 22 H 14 ), ( b ) indenofluorene (C 20 H 14 ), and ( c ) 11H-Benzo[b]fluoreno[2,3-d]thiophene (C 19 H 12 S). Picene molecule has overcrowded H atoms whose H-H distances are much shorter than the accepted van der Waals contacts. Two-directional
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Sulfur  L -edge XANES spectra for a standard coal from Rasa (Croatia) and r...
Published: 01 December 2005
for the Rasa coal was obtained with 40% thiophenic S (B), 30% thioxanthone (C) and 30% aryl disulfide (D) (after Kasrai et al. 1996b ).
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—Change of kerogen chemical structure from onset of oil generation (a) to e...
Published: 01 December 1987
and thiophenic rings are hatched to show size and orientation of polyaromatic sheets.