Regioselective Nitration of Inactive 4,4-Dibromobiphenyl with Nitrogen Dioxide and Molecular Oxygen over Zeolites: An Efficient Preparation of 4,4'-Dibromo-2-nitrobiphenyl
作者:Wei Wang、Xinhua Peng、Nan Chen
DOI:10.5012/jkcs.2014.58.1.72
日期:2014.2.20
In the presence of zeolites, 4,4'-dibromobiphenyl could be region-selectively nitrated by the action of nitrogen dioxide and molecular oxygen. The ratio of 4,4'-dibromo-2-nitrobiphenyl to 4,4'-dibromo-3-nitrobiphenyl could reach 14 in a high yield of 90%. Zeolites could be easily regenerated by heating and reused four times to give the results similar to those obtained with fresh catalyst. Compared with the classic nitration method, no nitric acid and sulfuric acid were used, which suggested that the method was an environmentally economic process.
在沸石的存在下,4,4'-二溴联苯可在二氧化氮和分子氧的作用下被区域选择性地硝化。4,4'-二溴-2-硝基联苯与 4,4'-二溴-3-硝基联苯的比例可达 14,产率高达 90%。沸石很容易通过加热再生,并可重复使用四次,结果与使用新鲜催化剂所得结果相似。与传统的硝化方法相比,该方法无需使用硝酸和硫酸,是一种环保经济的工艺。