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The in-situ Laser Scattering Electrospray Ionization Mass Spec-trometry and Its Application in the Mechanism Study of Photo-Induced Direct C-H Arylation of Heteroarenes.

An in-situ laser scattering electrospray ionization mass spectrometry (LS-ESI-MS) was developed. The laser scattering was simply achieved through the laser radiation of the "media" modified on the capillary. The laser scattering extended the reaction window and powerfully promoted the reaction yield of the photo-induced organic reaction, which make the trace intermediates being efficiently traced in real time. For instance, the key radical cation in the photo-induced direct C-H arylation of heteroarenes was capture inventively, which provided direct experimental evidence for the verification of the reaction mechanism. Together with the characterization of oxidative photocatalytic Ru(III) intermediate, the inte-gral insight into the process of visible-light-mediated direct C-H arylation of heteroarenes was confirmed. This approach is facile, powerful and promising in the mechanism study of organic reaction.