An environmentally friendly approach to the green synthesis of azo dyes with aryltriazenes via ionic liquid promoted C-N bonds formation
作者:Yonghong Zhang、Yonghong Liu、Xiaoqian Ma、Xia Ma、Bin Wang、Hongguang Li、Yan Huang、Chenjiang Liu
DOI:10.1016/j.dyepig.2018.05.073
日期:2018.11
An efficient and green approach for the synthesis of azo dyes has been developed via the Brønsted acidic ionicliquid (IL) promoted diazo coupling reaction of naphthols with aryltriazenes. The reaction was carried out with the aryltriazenes as diazotizing agents, the Brønsted acidic ionicliquids as the promoter, and water as the green solvent at room temperature under air and metal-free conditions
The bifunctional Lewis acidic ionicliquid (LAIL) catalyzed multicomponent arylsulfonation of phenols with aryl triazenes and DABSO was developed. By using LAILs as redox and Lewis acidic catalysts without any additional promoter or ligand through an N2 extrusion/SO2 insertion sequence, various aryl triazenes were transformed into aryl sulfonyl radicals by coupling with DABSO, and these were then coupled
开发了双功能路易斯酸性离子液体 (LAIL) 催化苯酚与芳基三氮烯和 DABSO 的多组分芳基磺化。通过使用 LAILs 作为氧化还原和路易斯酸性催化剂,无需任何额外的促进剂或配体,通过 N 2挤出/SO 2插入序列,各种芳基三氮烯通过与 DABSO 偶联转化为芳基磺酰基自由基,然后与苯氧基自由基偶联得到相应的二芳基砜以良好的收率。良好的官能团耐受性、克级反应和避免使用 SO 2气体进一步证明了该芳基磺化反应的实用性。