Incross-coupling reactions, the component reagents are calledcross-coupling partners or simplycoupling partners. These reagents can be further classified according to theirnucleophilic vselectrophilic character:
Typically theelectrophilic coupling partner (R-X) is an aryl halide, but triflates are also used. Nucleophilic coupling (R'-Y) partners are more diverse. In theSuzuki reaction,boronic esters andboronic acids serve asnucleophilic coupling partners.[1] Expanding the scope of coupling partners is a focus methods development inorganic synthesis.[2][3]