Olefin (alkene) purification is an important process in modem chemical industry, because organic feedstocks are largely olefin-based.The traditional method, cryogenic distillation, is energy-intensive and expensive.Approaches based on chemical reactions of olefins with metal salts such as copper are more efficient, but these metal salts are poisoned and deactivated by common olefin impurities, such as CO, H2S and acetylene.Several studies, which include x-ray crystallographic characterization of cis-interligand adducts, reported that dithiolene complexes have high reactivity toward strained and cyclic alkenes (such as norbornadiene).