title: Real-time, on-line monitoring of organic chemical reactions using extractive electrospray ionization tandem mass spectrometry.
abstract: Extractive electrospray ionization mass spectrometry (EESI-MS) for real-time monitoring of organic chemical reactions was demonstrated for a well-established pharmaceutical process reaction and a widely used acetylation reaction in the presence of a nucleophilic catalyst, 4-dimethylaminopyridine (4-DMAP). EESI-MS provides real-time information that allows us to determine the optimum time for terminating the reaction based on the relative intensities of the precursors and products. In addition, tandem mass spectrometric (MS/MS) analysis via EESI-MS permits on-line validation of proposed reaction intermediates. The simplicity and rapid response of EESI-MS make it a valuable technique for on-line characterization and full control of chemical and pharmaceutical reactions, resulting in maximized product yield and minimized environmental costs.
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhu
authors.forename: Gerardo
authors.initials: G
authors.lastname: Gamez
authors.forename: Huan Wen
authors.initials: HW
authors.lastname: Chen
authors.forename: Hao Xi
authors.initials: HX
authors.lastname: Huang
authors.forename: Konstantin
authors.initials: K
authors.lastname: Chingin
authors.forename: Renato
authors.initials: R
authors.lastname: Zenobi