作者:Pin‐Hsien Chen、Shu‐Jung Hsu、Duen‐Ren Hou
DOI:10.1002/adsc.202301200
日期:2024.4.9
A nitrosonium catalyzed bromination of electron-rich arenes has been developed, using bromide salts as bromine sources, oxygen gas as a terminal oxidant and Brønsted acids (sulfuric acid, TFA or HBr). This arene bromination process is free of transition metals, proceeding in acetic acid and under mild temperatures (25-50 °C) to give brominated arenes with good to excellent yields. Our mechanistic studies
已经开发出一种亚硝鎓催化的富电子芳烃溴化方法,使用溴化物盐作为溴源,氧气作为终端氧化剂和布朗斯台德酸(硫酸、TFA或HBr)。该芳烃溴化工艺不含过渡金属,在乙酸和温和温度(25-50 °C)下进行,以良好至优异的收率得到溴化芳烃。我们的机理研究表明,芳烃的氧化溴化反应是由亚硝鎓离子 (NO+) 催化的,没有 Br2 或 Br+ 的参与。使用五氘代苯基苯基醚(kH/kD = 1.1)测量该反应的动力学同位素效应。