摘要
Complexes [Cu(i)(2,4-dimethylphenoxy) 2 ] - (A) and [Cu(ii)(2,4-dimethylphenoxy) 2 (p-tolyl)] - (B) were observed by in situ electrospray ionization mass spectrometry (ESI-MS) analysis of the ligand free copper(i)-catalyzed C-O coupling reaction using Cs 2 CO 3 under the catalytic reaction conditions indicating that they could be intermediates in the reaction. The radical scavenger cumene retarded the reaction. Catalytic cycles involving a free radical path are proposed based on these observations.