Dimer or a composition containing the oligomeric ferrocene

摘要

In Problems fuel combustion system to provide a reproducing method of using the same and compositions which can be lowered the temperature of the exhaust trap stably even at low temperatures. A [MEANS FOR SOLVING PROBLEMS] composition, i) the general formula (I) X-Y (I) and one or more of the compounds represented by the formula comprises a carrier or ii) a diluent, the compound represented by Formula 2 or more (I) is, relative to the weight of the composition or one such I is present in a sufficient amount capable of supplying iron of at least 1% by weight.