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: Radiation spectrums of relativistic charged particles in a dipolar magnetic field were studied numerically in detail by using the current density of moving charged particles in this paper.
中文: 摘要从运动的荷电粒子产生的流密度出发，研究了在地球偶极磁场中运动的相对论性荷电粒子的辐射能量谱，并对其进行数值计算。
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英文: Synthesis of Chiral Bisoxazolines and Bisthiazolines Ligands and Their Application in Asymmetric 1,3-dipolar Cycloaddition Reactions A series.
中文: 第二章手性双噁(噻)唑啉配体的合成及不对称催化1，3-偶极环加成反应 本文合成了一系列C_2对称的手性双噁唑啉，双噻唑啉配体，将这些配体与Lewis酸络合，考查了其催化1，3-偶极环加成反应的的区域选择性及对映选择性。
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英文: In dilute solution of aprotic dipolar solvent, using potassium ion as template, 8 - crown - was synthesized by using triethylene glycol and ,- dioxa -,8- dichlorooctane as raw materials, and purified via 8 - crown - -MeNO (:) complex.
中文: 用钾离子为模板,采用稀释法,以三甘醇和 ,-二氧-,8-二氯辛烷为原料,经Williamson反应合成了8-冠-,并用硝基甲烷进行提纯。
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