Substituted acetophenones at the para or meta position of aromatic ring gave α-bromoacetophenones in high yield. 对位和间位取代的苯乙酮获得了高的产率;
The experiment results demonstrated that the quinoxalone derivatives could selectively recognize Cu~ ( 2+), and the Ks of the sulfonamide unit in the meta position of phenyl ring is 100 times than that in the para position. 实验结果表明它们能选择性识别Cu~(2+),并且磺酰胺单元处于芳基的间位时,其配位常数Ks值比其处于对位时大100倍左右。
Some Criterions of the Electrophilic Substitution Reactivity at the Ortho, Para and Meta Position of the Mono-substituted Benzenes 一元取代苯邻、间、对位亲电取代反应活性的几种判据
Amino-group is play a part of auxiliary forming para, ortho or meta position structure mainly; 氨基官能团主要起到与其它活性官能团形成对位、邻位或间位结构的辅助作用;
Phenol biodegradation is controlled by multi component genes to form different catabolic pathways of meta position and ortho position. 苯酚的生物降解受多组分的降解基因控制,形成邻位和间位等不同的代谢途径。