Exploring Flow Procedures for Diazonium Formation


University of Durham


The synthesis of diazonium salts is historically an important transformation extensively utilized in dye manufacture. However the highly reactive nature of the diazonium functionality has additionally led to the development of many new reactions including several carbon-carbon bond forming processes. It is therefore highly desirable to determine optimum conditions for the formation of diazonium compounds utilizing the latest processing tools such as flow chemistry to take advantage of the increased safety and continuous manufacturing capabilities. Herein we report a series of flow-based procedures to prepare diazonium salts for subsequent in-situ consumption.

Flow reactor loading set-up.


Direct in-line mass spec analysis was performed using the Advion Interchim Scientific® expression® Compact Mass Spectrometer (CMS) with electrospray ionization (ESI).