芴系列化合物的成因

The Mechanism on Formation of Fluorene Series Compounds

模拟实验揭示出:芴系列化合物的形成并不依赖于具有相同碳骨架的生物前身物质,在一定温度条件下,β胡萝卜素可以转化成芴系列,而硫和链状化合物反应可以形成更为丰富的芴系列化合物。β胡萝卜素在芳构化过程中会出现部分甲基脱落、甲基转移等变化,而且甲基上的活泼氢也会部分脱离,这样形成的自由基就可能结合成键形成芴系列;β胡萝卜素在热演化过程中生成的二苯甲烷系列可进一步转化成芴系列;硫在和链状化合物反应时也可能先形成一些二苯甲烷系列化合物,硫继续和这些产物反应会夺取两个苯环上的α位氢形成自由基,当一个苯环上的自由基和另一个苯环上的自由基结合时就可能形成芴系列。芴系列虽然具有生物骨架,但不能被认为是生物标志化合物,因为其地球化学合成作用形成的可能占多数。

Based on the simulation experiment it is discovered that the generation of fluorene series compounds on the biological precursors with the same structure. At a certain temperature, β carotene can transform into fluorene series and the reaction of sulphur with chain organic compounds can form more abundant fluorene series. While aromatizing, some changes such as methyl coming off, methyl removing and hydrogen of methyl coming off may take place in β carotene, which will form a great deal of free radicals, and the fluorene series will be formed when the free radicals form bond; The diphenyl methanes formed by β carotene may transform into fluorene series compounds; The reaction of sulphur with chain compounds forms possibly some diphenyl methanes at first, then sulphur acts on the products and seizes the α H of the two aromatic nuclei to form free radicals. When the free radical of one aromatic nucleus combines another one′s, fuorene is formed. Although flourene series have the biological carbon skeleton, they should not be referred to as biomarkers for they were mainly formed by geochemical synthesis .