以下为句子列表：
英文: Even worse, the products with vapor pressures corresponding to gasoline were largely linear hydrocarbons with poor octane numbers.
中文: 更糟糕的是，蒸气压与汽油相当的产品主要是低辛烷值的链状烃。
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英文: For gasoline production the octane loss has to be minimized.
中文: 生产汽油时辛烷值之丧失，必须抑制到最低程度。
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英文: However, the yield of gasoline was still low relative to the amount of petroleum processed, and the quality, as measured by octane number, was inadequate for high-performance engines.
中文: 然而，相对于所消耗的石油来讲，汽油的产量仍较低，而且其质量，以辛烷值的大小来衡量，也不适用于高性能的发动机。
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英文: The introduction of acidic aluminosilicates as cracking catalysts in the 1940s led to higher yields of branched hydrocarbons with improved octane numbers.
中文: 40年代作为裂化催化剂的酸性的铝硅酸盐的引入提高了辛烷值较高的支链烃的产量。
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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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