However, cross-electrophile coupling (XEC) approach would be a powerful tool for the construction of (hetero)biaryl moiety because of the widespread availability and stability of (hetero)aryl electrophiles (Fig. ). Although the symmetric Ullmann coupling has been well known for more than a century, cross coupling of two unsymmetrical aryl electrophiles has not found extensive application until recently because of the competing homodimer formation . Methods such as one-pot, two-step coupling and reductive cross-coupling , in which stoichiometric metal reductant controls the sequential oxidative addition of catalytic metal complex to (hetero)aryl halides, have been developed over the years to overcome this difficulty. Notably, the later coupling approach would be effective only when two electrophilic coupling partners have significantly different reactivities. Weix , Toste and Ye 31 independently developed multimetallic catalysis strategy, which relies on the in situ generation of organometallic aryl intermediate to facilitate the transmetalation step, for the cross-electrophile coupling. Despite these advances in the field of cross-electrophile coupling, the most significant challenges persist. These include the substrate specificity, the use of multimetallic systems to distinguish reactivity, the utilization of super stoichiometric metal reductants such as Zn, Mn, Mg, etc., or the incorporation of specially synthesized zirconaaziridine complex.