Lin Zhang, Qinglang Song, Yanxian Wang, Rui Chen, Yu Xia, Bin Wang, Weiwei Jin, Shaofeng Wu, Ziren Chen, Azhar Iqbal, Chenjiang Liu and Yonghong Zhang
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Solvent-free mechanochemical synthesis of azo dyes†
An efficient diazotization of phenolic compounds with aryltriazenes is herein demonstrated by employing ball milling under catalyst-, promoter- and solvent-free conditions. The present protocol offers several advantages including mild conditions, good selectivity and high yields, simple operation and practical gram-scale synthesis. Overall, this novel strategy significantly improves the reaction efficiency, simplifies purification procedures of the diazotization reaction and provides potential for the industrial preparation of azo dyes.
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