Continuous-flow meerwein arylation
Title | Continuous-flow meerwein arylation |
Publication Type | Journal Article |
Year of Publication | 2014 |
Authors | Bhaya, VG, Joshi, RA, Kulkarni, AA |
Journal | Journal of Flow Chemistry |
Volume | 4 |
Issue | 4 |
Pagination | 211-216 |
Date Published | DEC |
Type of Article | Article |
ISSN | 2062-249X |
Keywords | diazonium salt, flow chemistry, homogeneous catalyst, Meerwein arylation, micromixer, multistep synthesis |
Abstract | The continuous-flow Meerwein arylation is demonstrated for a set of few aryl donors (anilines and m-aminoacetophenone) and specific radical acceptors. Homogeneous catalyst (CuBr in HBr and CuCl in HCl) was used to facilitate the reaction. The effect of parameters, viz., temperature, catalyst concentration, residence time, and concentration of the radical acceptor on the yield of the arylated product, was studied. The yield of the aryl derivative obtained by continuous-flow syntheses was always better than the respective experiments in batch mode. Flow synthesis allows easy variation in these parameters and thus allows going close to the maximum possible yields in a system where the relative rates of different reactions create a complex situation. Temperature plays a crucial role by affecting the rates as well as by governing the system homogeneity. The nitrogen bubbles generated in the reaction helped to avoid any channel blockage. |
DOI | 10.1556/JFC-D-14-00023 |
Type of Journal (Indian or Foreign) | Foreign |
Impact Factor (IF) | 1.942 |