Grubbs catalysts are a group of chemical compounds used in olefin metathesis, a reaction that allows the exchange of parts between different alkenes. Named after chemist Robert H. Grubbs, these catalysts facilitate the formation of new carbon-carbon bonds, making them valuable in organic synthesis and materials science. There are several generations of Grubbs catalysts, each improving on the efficiency and selectivity of the previous one. They typically contain a molybdenum or ruthenium center and are known for their stability and versatility in various chemical reactions, including the production of polymers and pharmaceuticals.