Nitration of moderately deactivated arenes with nitrogen dioxide and molecular oxygen under neutral conditions. Zeolite-induced enhancement of regioselectivity and reversal of isomer ratios
作者:Xinhua Peng、Naoyuki Fukui、Masayuki Mizuta、Hitomi Suzuki
DOI:10.1039/b301847d
日期:——
and methylated benzonitriles can be smoothly nitrated at room temperature by the combined action of nitrogen dioxide and molecular oxygen. The regioselectivity is considerably improved as compared with the conventional nitration methodology based on nitric and sulfuric acids. In some cases, the minor isomer became favoured to a significant extent, resulting in the reversal of ordinary isomer ratios
在沸石的存在下,通过二氧化氮和分子氧的共同作用,可以在室温下将中等程度失活的芳烃(例如1-硝基萘,萘腈和甲基化的苄腈)平稳地硝化。与基于硝酸和硫酸的常规硝化方法相比,区域选择性显着提高。在某些情况下,次要异构体在很大程度上受到青睐,导致硝化产物的普通异构体比率逆转。