吸电子取代基;拉电子取代基
The results show that the potential of the oxidation peak of 1,4-DHP ( E_ ( pa)) becomes more positive, and the oxidation process is more difficult with an increase in the electron-attractive ability of the substituent at the C-4 position.
结果表明,1,4-DHP在GC电极上的氧化峰峰电位(EPa)随着C-4取代基的吸电子能力增强而升高,氧化反应越来越难进行。
The corresponding aldehyde acetals were obtained in almost quantitative yields when alcohols were treated with aromatic aldehydes bearing an electron-withdrawing substituent such as a nitro group.
当强吸电子的芳香醛为底物如硝基取代的苯甲醛时,几乎定量给出相应的缩醛产物。
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