The most important methods in chemical synthesis include C-C coupling reactions that are aided by visible light. A significant amount of work has been spent researching the production of various molecular patterns from reasonable bespoke assembly barriers. When two fragments are brought together with the help of a metal catalyst, a number of reactions are referred to as coupling reactions in organic chemistry. In one significant kind of reaction, an organic halide of type R'-X combines with a main group organometallic compound of type R-M (R = organic fragment, M = main group centre), resulting in the creation of a new carbon-carbon bond in the product R-R'. The cross coupling reaction is the most typical sort of coupling reaction.