Methylcyclopentadienylmanganese Tricarbonyl

METHYLCYCLOPENTADIENYLMANGANESE TRICARBONYL Chemical Designations - Synonyms Combustion Improver C12 Chemical Formula C, 703Mn. Observable Characteristics - Physical State (as shipped) Liquid Color Straw to dark orange Odor Faint, pleasant, herbaceous. 

In 1957, Ethyl Corp. announced a new antiknock compound, methylcyclopentadienylmanganese tricarbonyl [12108-13-3] (MMT). MMT is almost as effective as lead on a per gram of metal basis, but because manganese was more expensive than lead, MMT was not widely used until limits were placed on the lead content of gasoline. MMT was used in unleaded fuel between 1975 and 1978. After a large fleet test suggested that MMT could increase exhaust emissions because it interfered with catalysts and oxygen sensors, EPA banned its use in unleaded fuel in 1978. MMT is used in Canada in unleaded fuel. 

The use of methylcyclopentadienylmanganese tricarbonyl and related compounds as antiknock agents in gasoline 18j 19, 39),... 

The largest consumption of sodium worldwide, as of the mid-1990s, is the production of tetraethyllead and tetramethyllead antiknock compounds for gasoline. This production is outside of North America. Sodium is also used for the production of other organometallic compounds such as methylcyclopentadienylmanganese tricarbonyl (MMT), another gasoline additive. 

Methylcyclopentadienylmanganese tricarbonyl Gasoline, aircraft fuels Antiknock agent... 

Gas Chromatographic Determination of Methylcyclopentadienylmanganese-tricarbonyl in Biological Tissues and Fluids... 

Table 160. Measured Levels of Methylcyclopentadienylmanganese-tricarbonyl (MMT) in Commercial Gasolines...

---