Matches in SemOpenAlex for { <https://semopenalex.org/work/W2003256570> ?p ?o ?g. }
- W2003256570 endingPage "539" @default.
- W2003256570 startingPage "520" @default.
- W2003256570 abstract "Abstract Novel side chain methylated and hexacyclic hopanes have been identified in coals and oils from around the world. Extended hopanes (>C 32 ) with an additional methyl in the side chain (“isohopanes”) were identified by comparison with synthetic standards. The major C 33 –C 35 isohopanes are 31-methylbishomohopanes, 32-methyltrishomohopanes and 33-methyltetrakishomohopanes. Extended hopanes methylated at C-29 were not detected. The 17α(H),21β(H)-31-methyltrishomohopanes show four peaks on gas chromatography because of the extra asymmetric carbon at C-31. Like regular hopanes, the isohopanes extend beyond C 35 . Low concentrations of novel hexacyclic hopanes having 35 or more carbons were also detected in oils and coal extracts. The C 35 hexacyclic hopanes were identified as 29-cyclopentylhopanes. Isohopanes are released from the kerogen by hydrous pyrolysis and hydropyrolysis. The 22S/(22S + 22R) ratio for 31-methylbishomohopanes and other isohopanes is around 0.60 at equilibrium in geological samples. They isomerize slightly more slowly than regular C 33 hopanes. Isohop-17(21)-enes, 2α-methylisohopanes and two series of rearranged isohopanes were tentatively identified. Isohopanes can be biodegraded to form the corresponding 25-norhopanes. When 25-norhopanes are not formed, the isohopanes are much more resistant to biodegradation than regular hopanes. In biodegraded oil seeps from Greece, 30-norisohopanes were tentatively assigned. The composition and relative abundance of C 33 and C 34 isohopanes in a worldwide set of coals and crude oils was determined. Isohopanes are abundant in coal and coal-generated oils, where they can account for more than 5% of all extended hopanes, and low in abundance in oils from source rocks deposited under anoxic conditions." @default.
- W2003256570 created "2016-06-24" @default.
- W2003256570 creator A5037757810 @default.
- W2003256570 date "2011-06-01" @default.
- W2003256570 modified "2023-09-25" @default.
- W2003256570 title "Novel side chain methylated and hexacyclic hopanes: Identification by synthesis, distribution in a worldwide set of coals and crude oils and use as markers for oxic depositional environments" @default.
- W2003256570 cites W1595093547 @default.
- W2003256570 cites W1964318997 @default.
- W2003256570 cites W1973452560 @default.
- W2003256570 cites W1974896345 @default.
- W2003256570 cites W1979510084 @default.
- W2003256570 cites W1980542896 @default.
- W2003256570 cites W1980849613 @default.
- W2003256570 cites W1981066918 @default.
- W2003256570 cites W1985522861 @default.
- W2003256570 cites W1986447251 @default.
- W2003256570 cites W1987482547 @default.
- W2003256570 cites W1989281753 @default.
- W2003256570 cites W1990565062 @default.
- W2003256570 cites W1990701645 @default.
- W2003256570 cites W1994316586 @default.
- W2003256570 cites W1996101120 @default.
- W2003256570 cites W2001641957 @default.
- W2003256570 cites W2006294905 @default.
- W2003256570 cites W2007795902 @default.
- W2003256570 cites W2008147184 @default.
- W2003256570 cites W2010844773 @default.
- W2003256570 cites W2011589093 @default.
- W2003256570 cites W2013622995 @default.
- W2003256570 cites W2017510711 @default.
- W2003256570 cites W2022453227 @default.
- W2003256570 cites W2025027959 @default.
- W2003256570 cites W2029260091 @default.
- W2003256570 cites W2033323084 @default.
- W2003256570 cites W2034516394 @default.
- W2003256570 cites W2039074563 @default.
- W2003256570 cites W2039443510 @default.
- W2003256570 cites W2041396316 @default.
- W2003256570 cites W2041513540 @default.
- W2003256570 cites W2044581838 @default.
- W2003256570 cites W2045839393 @default.
- W2003256570 cites W2051652833 @default.
- W2003256570 cites W2052794190 @default.
- W2003256570 cites W2053080324 @default.
- W2003256570 cites W2056718545 @default.
- W2003256570 cites W2057570153 @default.
- W2003256570 cites W2061932403 @default.
- W2003256570 cites W2062503321 @default.
- W2003256570 cites W2067166341 @default.
- W2003256570 cites W2067209017 @default.
- W2003256570 cites W2069245686 @default.
- W2003256570 cites W2072681874 @default.
- W2003256570 cites W2074445791 @default.
- W2003256570 cites W2077027695 @default.
- W2003256570 cites W2084920508 @default.
- W2003256570 cites W2089194183 @default.
- W2003256570 cites W2089969536 @default.
- W2003256570 cites W2091891066 @default.
- W2003256570 cites W2092126103 @default.
- W2003256570 cites W2117420594 @default.
- W2003256570 cites W2121303863 @default.
- W2003256570 cites W2140973478 @default.
- W2003256570 cites W2165929048 @default.
- W2003256570 cites W2166529958 @default.
- W2003256570 cites W2167850211 @default.
- W2003256570 cites W2261443321 @default.
- W2003256570 cites W2327874279 @default.
- W2003256570 cites W2331832733 @default.
- W2003256570 cites W3168724856 @default.
- W2003256570 cites W4233615550 @default.
- W2003256570 doi "https://doi.org/10.1016/j.orggeochem.2011.03.006" @default.
- W2003256570 hasPublicationYear "2011" @default.
- W2003256570 type Work @default.
- W2003256570 sameAs 2003256570 @default.
- W2003256570 citedByCount "20" @default.
- W2003256570 countsByYear W20032565702012 @default.
- W2003256570 countsByYear W20032565702014 @default.
- W2003256570 countsByYear W20032565702015 @default.
- W2003256570 countsByYear W20032565702016 @default.
- W2003256570 countsByYear W20032565702019 @default.
- W2003256570 countsByYear W20032565702020 @default.
- W2003256570 countsByYear W20032565702021 @default.
- W2003256570 countsByYear W20032565702022 @default.
- W2003256570 countsByYear W20032565702023 @default.
- W2003256570 crossrefType "journal-article" @default.
- W2003256570 hasAuthorship W2003256570A5037757810 @default.
- W2003256570 hasConcept C107872376 @default.
- W2003256570 hasConcept C109007969 @default.
- W2003256570 hasConcept C110121322 @default.
- W2003256570 hasConcept C116834253 @default.
- W2003256570 hasConcept C126559015 @default.
- W2003256570 hasConcept C126753816 @default.
- W2003256570 hasConcept C127313418 @default.
- W2003256570 hasConcept C134306372 @default.
- W2003256570 hasConcept C151730666 @default.
- W2003256570 hasConcept C167195282 @default.
- W2003256570 hasConcept C17409809 @default.
- W2003256570 hasConcept C185592680 @default.