Isolation and structural characterisation of isopimarane in some New Zealand seep oils

Blunt, John W.; Czochanska, Zofia; Sheppard, C.M.; Weston, Roderick J.; Woolhouse, Anthony D.

doi:10.1016/0146-6380(88)90157-x

Cited by 16 publications

(4 citation statements)

References 20 publications

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“…Isopimarane (XV) and 18-norisopimarane (X) were the second most common compounds of the diterpenoid class, with the first one present at elevated concentrations (>50 units) in samples 1, 2, 3, 6, 11b, 15b, 17b, 18a, 21b, 22 and 24. High abundances of pimaranes (indicators of conifer families such as Pinaceae and Cupressaceae), as well as isopimaranes (common in all conifer families except Cephalotaxaceae; Otto and Wilde, 2001), are consistent with earlier reports postulating these compounds as conifer markers (Noble et al, 1986;Blunt et al, 1988;Philp, 1994). Sample 6 exhibited a high relative concentration of isophyllocladene (XIII, Fig.…”

Section: Diterpenoidssupporting

confidence: 87%

Geochemical characterization and palaeoenvironmental implications of lipids in Neogene lignites and lignitic shales in NW Poland

Czechowski,

Polowczyk,

Simoneit

et al. 2023

ASGP

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Section: Diterpenoidssupporting

confidence: 87%

Geochemical characterization and palaeoenvironmental implications of lipids in Neogene lignites and lignitic shales in NW Poland

Czechowski,

Polowczyk,

Simoneit

et al. 2023

ASGP

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“…8 c). Ent -beyerane originates from ent -beyerene 69 , 70 , while isopimaric acid is the precursor of isopimarane 71 . These diterpanes can also derived from labdane derived copalyl pyrophosphate 72 .…”

Section: Discussionmentioning

confidence: 99%

Paleoenvironment reconstruction and peat-forming conditions of Neogene paralic coal sequences from Mukah, Sarawak, Malaysia

Abidin

Mustapha

Abdullah

et al. 2022

Sci Rep

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Eight coal seams containing Neogene paralic coals from the Mukah coalfield, Sarawak, Malaysia, were investigated using petrographical, palynological, and organic geochemical analyses to describe coal-forming vegetation, paleoclimatic, and paleoenvironment conditions during peat development and precursor mires, as well as their associations within a sequence-stratigraphic context. The petrographic and geochemical data of the coals imply the existence of oxygen-deficient and water-saturated conditions in the precursor mires. The reducing conditions in the mires were followed by biomass loss. The Mukah coals are suggested to be deposited in freshwater peat swamps, and the rich preservation of angiosperm pollen indicates that the organic matter in dense and lowland forest vegetation was mostly terrigenous. The overwhelming presence of Casuarina and Calamus types suggest the paleomires were closely linked to the Kerapah/Kerangas peat forest and were marginally bordered by rattan, which was supported by biomarker data. Rheotrophic–ombrotrophic mires temporarily formed due to water table fluctuations, which were strongly dependent on ever-wet climate changes and syn-depositional tectonics during the Neogene, and resulted in the balanced to high peat accumulation and preservation. A maximum thickness of 35 m of peat deposits is suggested to form between 10,000 and 175,000 years ago based on the peat:coal ratio. The coals are proposed to be influenced by transgressive to initial highstand cycles within the paralic setting.

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“…Isopimarane (Noble et al, 1986;Blunt et al, 1988) was also present, but the rest appeared to be novel compounds. They could be saturated icetexanes.…”

Section: Dehydroicetexanes In Sediments and Crude Oilsmentioning

confidence: 98%

Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

Nytoft

Kildahl-Andersen

Lindström

et al. 2019

Organic Geochemistry

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Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMR-spectroscopy as cis-and trans-dehydroicetexane. Both have a 9(10→20)-abeo-abietane or icetexane skeleton consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging from Triassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis+ trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%R r ) above 0.5 suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetaxanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.

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Isolation and structural characterisation of isopimarane in some New Zealand seep oils

Cited by 16 publications

References 20 publications

Geochemical characterization and palaeoenvironmental implications of lipids in Neogene lignites and lignitic shales in NW Poland

Geochemical characterization and palaeoenvironmental implications of lipids in Neogene lignites and lignitic shales in NW Poland

Paleoenvironment reconstruction and peat-forming conditions of Neogene paralic coal sequences from Mukah, Sarawak, Malaysia

Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

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