【摘要】 芳环上取代基的定位效应是芳烃一章教学中的重点和难点之一。本文结合多年的教学实践和探索,总结出一套简便判断取代基定位效应的方法,即通过分析取代基与芳环直接相连原子的正负性来判断取代基的定位效应。运用该方法,学生能轻松掌握芳烃取代基的定位规律,教学效果显著。更多还原

【Abstract】 The orientation effect of substituents on aryl ring is one of teaching emphasis and difficulty in aromatic hydrocarbon chapter. In this paper, an easy way was put forward to judge the orientation effect of substituents. Firstly, to analyze the positive/negative of the carbon directly connected to aromatic ring, and then confirm the positive/negative of each carbon on aromatic ring according to the charge principle of similar poles repel and opposite poles attract. Using this way, the student can easily understand the orientation rules t of substituents.更多还原