Synthesis of N,N-diethyl-N-{4-[(E)-(4-nitrophenyl)diazenyl]phenyl}amine via in situ diazotisation and coupling in supercritical carbon dioxide |
| |
Authors: | Jacob Hooker David Hinks Gerardo Montero Christopher Conlee |
| |
Affiliation: | Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, North Carolina 27695-8301, USA Email:;Kenan Center for the Utilization of Carbon Dioxide in Manufacturing, Department of Chemical Engineering, North Carolina State University, Raleigh, NC 27606-7565, USA |
| |
Abstract: | The synthesis of azo dyes via a conventional aqueous-based diazotisation and coupling reaction requires the use of relatively high concentrations of mineral acids, which leads to high electrolyte concentrations in wastewater. Reported in this paper is an environmentally benign one-pot method for the synthesis of a nonionic azo dye, N,N -diethyl- N -{4-[( E )-(4-nitrophenyl)diazenyl]phenyl}amine, in supercritical carbon dioxide without using a mineral acid. The product yield increased significantly with temperature, with 91% theoretical yield afforded at 80 °C. The pressure of the system had little influence on product yield. |
| |
Keywords: | |
|
|