limitations of the base-free oxidativeHeckreaction with arylboronicacids have been explored. Under our conditions, the dmphen−palladium(II)-catalyzed arylation proceeded with air or p-benzoquinone as reoxidants of palladium(0). We found that ambient temperature and mild aerobic conditions allow for the use of substrates sensitive to palladium(II)-catalyzedoxidation. OxidativeHeck couplings, employing