Dicarbon monoxide
Dicarbon monoxide (CO) is a molecule that contains two carbon atoms and one oxygen atom. It is a linear molecule that, because of its simplicity, is of interest in a variety of areas. It is, however, so extremely reactive that it is not encountered in everyday life. It is classified as a cumulene and an oxocarbon. Occurrence. Dicarbon monoxide is a product of the photolysis of carbon suboxide: It is stable enough to observe reactions with NO and NO. Called ketenylidene in organometallic chemistry, it is a ligand observed in metal carbonyl clusters, e.g. [OCCo(CO)]. Ketenylidenes are proposed  as intermediates in the chain growth mechanism of the Fischer-Tropsch Process, which converts carbon monoxide and hydrogen to hydrocarbon fuels. The organophosphorus compound (CH)PCCO (CAS# 15596-07-3) contains the CO functionality. Sometimes called Bestmann's Ylide, it is a yellow solid.