An electron‐ionization (EI) mass spectra of a series of 1‐arylazonaphthalen‐2‐ols was obtained for studying the substituenteffect on the fragmentation. The correlation between the ratio, molecular ion and fragment ion, and Hammett’s constants is applied to examine the effect of the substituent on the fragmentation. The negative correction between the ratio, Imolecular ion/(I171amu + I143amu + I115amu)
获得了一系列1-芳基氮杂萘-2-醇的电子电离(EI)质谱图,以研究取代基对碎片的影响。比率,分子离子和碎片离子之间的相关性以及Hammett常数用于检查取代基对碎片的影响。I分子离子/(I 171amu + I 143amu + I 115amu)之比与Hammett常数之间的负校正表示吸电子基团使分子离子不稳定。异常的远距离氢转移显示了在裂解过程中的重要作用
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