Tris(cyclooctatetraene)triiron or Fe(COT), also referred to as the Lavallo-Grubbs compound (after its discoverers) is an organoiron compound with the formula Fe(CH). It is a pyrophoric, black crystalline solid, which is insoluble in common organic solvents.The compound represents a rare example of a hydrocarbon analogue of the well-known Triiron dodecacarbonyl (Fe(CO)), originally prepared by Dewar and Jones in the early 20th century.