Abstract
Electrospray ionization/mass spectrometry (ESI‐MS) is used to monitor a Cu‐catalyzed aerobic cross‐coupling reaction between thiol esters and arylboronic acids. The ESI spectra show the formation of Cu‐complexes with the starting thiol ester 1 and the coupling product. The formation of an ionic complex at m/z 305 is observed, most likely occurring upon the elimination of a mixed anhydride from [(1)CuOAc]+. An online monitoring of the reaction using ESI‐MS was carried out allowing calculation of rate constants and thermodynamic parameters (ΔH‡, ΔS‡, and ∆G‡) for the title reaction.
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