Coupling Reactions Coupling reactions occur between organometallic with organic halide with the aid of a metal containing catalyst. Coupling reactions can be divided into two main classes, cross couplings in which two different molecules react to form one new molecule. The other type of coupling is homocoupling, in this reaction two similar molecules coupling together to form a new molecule.
Main features Common metal used in this field is Pd, in addition to Zn, Ni, Cu, B, and Sn. Most of coupling reactions are air and water sensitive ?? But, some coupling reactions can be carried out in aqueous solutions.