Electrospray ionization/mass spectrometry (ESI‐MS) is used to monitor a Cu‐catalyzedaerobiccross‐coupling reaction between thiolesters and arylboronicacids. The ESI spectra show the formation of Cu‐complexes with the starting thiolester 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]+
电喷雾电离/质谱(ESI-MS)用于监测铜催化的硫羟酸酯与芳基硼酸之间的需氧交叉偶联反应。ESI谱图显示了与起始硫羟酸酯1和偶联产物形成的铜络合物。观察到在m / z 305处形成离子络合物,最有可能是从[(1)CuOAc] +中消除了混合酸酐后发生的。使用ESI-MS对反应进行了在线监控,从而可以计算标题反应的速率常数和热力学参数(ΔH ‡,ΔS ‡和ΔG ‡)。