steric hindrance
空间位阻：由于分子中原子的排列而导致的化学反应受阻的现象。
常用释义
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美式发音
基本释义
- 空间位阻：由于分子中原子的排列而导致的化学反应受阻的现象。
例句
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1·In the end, the steric hindrance of the acetyl group was discussed.最后，本文讨论了空间位阻效应对反应性质的影响。
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2·The stereoselectivity was improved by increasing steric hindrance of the reactions.通过增加反应的空间位阻改进了反应的立体选择性。
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3·Nevertheless, steric hindrance caused by chemical structure reduces the retention time.药品化学结构引起之立体障碍会降低滞留时间。
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4·Based on this, the selectivity and steric hindrance for the adsorption of bile acids are discussed.对树脂吸附胆酸过程中的选择性和位阻作了讨论。
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5·It was considered that steric hindrance and electrostatic repulsion were the main stabilizing mechanism.空间位阻和静电排斥是其乳状液稳定的主要机理。
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6·This approach covers the substrate range of aliphatic, aromatic, heterocyclic and steric hindrance ketones.该催化剂适用于各种脂肪酮、芳香酮、杂环酮和位阻酮。
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7·Their extraction ability markedly decreases with the increase of the steric hindrance from ester alkyl group.萃取能力随着酯烷基空间位阻的增大而显著降低。
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8·The large steric hindrance group avails to the enantioselectivity, but too much steric hindrance reduces the activity.大位阻取代基有利于提高对映选择性，但位阻过大降低催化活性。
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9·The size and steric hindrance of substituent of porphyrin is one of the crucial factors to affect the interaction between porphyrins and DNA.吡啶取代基的大小和空间位阻是影响相互作用方式的关键因素之一。
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10·The dependence of chain scission and racemization on temperature results from molecular motion, "cage effect" and steric hindrance during recombination.分子量降低和消旋作用对温度的依赖性，是由于分子运动和笼罩效应以及重合的空间位阻效应所致。