以下为句子列表：
英文: A wide variety of natural products, e. g. alkaloids, β-lactames, biotin, amino sugars has been synthesized by 1, 3-dipolar cycloaddition reaction between nitrones and alkenes.
中文: 摘要通过硝酮与烯烃化合物的1，3-偶极环加成反应合成了许多天然産物，如生物硷、β-内酰胺、生物素、氨基糖等。
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英文: Abstract: A wide variety of natural products, e.g. alkaloids, β-lactames, biotin, amino sugars has been synthesized by 1,3-dipolar cycloaddition reaction between nitrones and alkenes.
中文: 文摘:通过硝酮与烯烃化合物的1，3-偶极环加成反应合成了许多天然产物，如生物碱、β-内酰胺、生物素、氨基糖等。
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英文: Abstract: This article reviews recent progress in nucleophilic reactions of the α-carbon in vinylidene ruthenium complexes. The nucleophiles include alkene, alkyne, alcohol, acid, amine, water, etc.
中文: 文摘:综述了近几年钌亚乙烯基络合物中间体α-碳的亲核反应。亲核试剂包括烯烃、炔烃、醇、酸、胺、水等。
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英文: Catalysis: Development of chirometallopor-phyrins as enantioselective oxidation catalysts of alkenes and sulfides.
中文: 催化作用：开发新型手性金属催化烯类及硫醚类之对映选择性氧化。
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英文: Chooses picture which you likes, if you need it are the oil paintingor the splendid alkene picture, may write plainly in the order form.We can draw up for you.
中文: 选择你喜欢的图片，如果你需要它是油画或炳烯画，可以在定单中写明。我们会为你绘制。
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