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
Kinetic Studies on the Thermal <i>cis</i>-to-<i>trans</i> Isomerization of 1-Phenyltriazenes Derived from Cyclic Amines
作者:Jinlong Fu、Kelvin Lau、Mónica Barra
DOI:10.1021/jo8024048
日期:2009.2.20
Rate constants for thermal cis-to-trans isomerization of N-(phenylazo)-substituted nitrogen ring heterocyles were determined as a function of phenyl ring substitution, cyclic amine ring size, and organic solvents. Observed first-order rate constants are found to increase with increasing electron-withdrawing character of the para substituent, with larger amine rings, and with increasing solvent polarity