General characteristics and biomarker distributions of Lower Permian coal-measure source rocks in northeastern Ordos Bsain have been analyzed in this paper. The results show that the source rocks are type Ⅲ kerogen, ...General characteristics and biomarker distributions of Lower Permian coal-measure source rocks in northeastern Ordos Bsain have been analyzed in this paper. The results show that the source rocks are type Ⅲ kerogen, thermally mature, with high content of total organic carbon. The extracts of the source rock samples with different lithologies from Well Su 27 feature high Pr/Ph ratios, high C19 TT and C24 Te, high rearranged hopanes, a predominance of C29 sterane in regular steranes, and the absence of C30 4-methylsteranes. These data suggest that the source rocks were deposited in suboxic to oxic conditions with dominantly terrigenous higher plant input. In contrast, the source rocks from wells Shuang 1 and Yu 20, are characterized by low Pr/Ph ratios, low C19 TT and C24 Te, high C23 TT, similar content of C27 sterane and C29 sterane, and the presence of C30 4-methylsteranes, showing that the source rocks were deposited in reducing environment with algae and/or microorganisms and terrigenous higher plant input.展开更多
Methylenecholestan 3 β,5α,6β triol 1 isolated from the soft coral, Sinularia dissecia has high antifouling property and biodecomposability in natural environment, safe for human bodies. We have synthesized compound...Methylenecholestan 3 β,5α,6β triol 1 isolated from the soft coral, Sinularia dissecia has high antifouling property and biodecomposability in natural environment, safe for human bodies. We have synthesized compound 1 in seven steps starting from stigmasterol 2 in overall yield of 31 3%. The side chain of stigmasterol 2 was modified to keto containing structure of compound 3 via hydroxy group and olefin protection, ozonization, wittig reaction and hydrogenation. The A/B ring was modified by oxidation with performic acid to give stereospecific 5 α,6β diol sterol 4. The compound 1 was then obtained by methylenation of cabonyl group at the 24C of 4 through Wittig reaction in a rather strict conditions. The mp, and NMR data of synthesized 1 were in good agreement with that of the natural compound reported by Masaru . This is the first time of the synthesis of 24 methylenecholest 3 β,5α,6β triol 1.展开更多
基金supported jointly by National Natural Science Foundation of China (Grant No. 41272170)National Science and Technology Major Projects (Grant No. 2011ZX05007-001-01)
文摘General characteristics and biomarker distributions of Lower Permian coal-measure source rocks in northeastern Ordos Bsain have been analyzed in this paper. The results show that the source rocks are type Ⅲ kerogen, thermally mature, with high content of total organic carbon. The extracts of the source rock samples with different lithologies from Well Su 27 feature high Pr/Ph ratios, high C19 TT and C24 Te, high rearranged hopanes, a predominance of C29 sterane in regular steranes, and the absence of C30 4-methylsteranes. These data suggest that the source rocks were deposited in suboxic to oxic conditions with dominantly terrigenous higher plant input. In contrast, the source rocks from wells Shuang 1 and Yu 20, are characterized by low Pr/Ph ratios, low C19 TT and C24 Te, high C23 TT, similar content of C27 sterane and C29 sterane, and the presence of C30 4-methylsteranes, showing that the source rocks were deposited in reducing environment with algae and/or microorganisms and terrigenous higher plant input.
文摘Methylenecholestan 3 β,5α,6β triol 1 isolated from the soft coral, Sinularia dissecia has high antifouling property and biodecomposability in natural environment, safe for human bodies. We have synthesized compound 1 in seven steps starting from stigmasterol 2 in overall yield of 31 3%. The side chain of stigmasterol 2 was modified to keto containing structure of compound 3 via hydroxy group and olefin protection, ozonization, wittig reaction and hydrogenation. The A/B ring was modified by oxidation with performic acid to give stereospecific 5 α,6β diol sterol 4. The compound 1 was then obtained by methylenation of cabonyl group at the 24C of 4 through Wittig reaction in a rather strict conditions. The mp, and NMR data of synthesized 1 were in good agreement with that of the natural compound reported by Masaru . This is the first time of the synthesis of 24 methylenecholest 3 β,5α,6β triol 1.
