Hoyevda has  modified a catalyst of this reaction that is based on a ruthenium center.
Nugent et al. developed a catalyst of this reaction that is active only in the presence of tetraethyllead. Compounds that  catalyze this reaction can be created by reacting the starting compounds with either a diazomethane or a cyclopropene  derivative. An early form of this reaction was carried out on large scales at Phillips Petroleum. Chauvin proposed the  now-accepted mechanism of this reaction, some catalysts of which are based on (*) tungsten or molybdenum. Hoyevda has  modified a catalyst of this reaction that is based on a ruthenium center. This reaction proceeds via a metallocyclobutane and a  metallocarbene intermediate, and this reaction is catalyzed by the Grubbs catalyst. For 10 points, name this reaction which results  in the exchange of substituent groups between two alkenes.
Nugent et al. developed a catalyst of this reaction that is active only in the presence of tetraethyllead.
olefin metathesis [accept ring opening metathesis polymerization; or ring closing metathesis; or cross metathesis or acronyms of those things]