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Hazard Predictions

• Potentially hazardous: May be hazardous but unknown

Some interactions between organo-transition metal compounds can result in redox reactions, which can be hazardous. Whether a particular combination will be hazardous depends on the oxidation states of the metals involved and the ligand environments around the metal centers. Generally speaking, metal compounds that do not follow the 18 electron rule will be more reactive and more likely to cause a hazardous situation (Crabtree, R. H. The Organometallic Chemistry of the Transition Metals, 4th ed.; Wiley-Interscience: Hoboken (NJ), 2005).

An example of a potentially hazardous reaction: Dimethyl and diphenyl zirconocene compounds were oxidized by the one-electron organometallic oxidant bis(methylcyclopentadienyl) iron (III) tetraphenylborate, i.e. [(C5H4Me)2Fe][BPh4], a ferrocenium derivative. The zirconium-containing product was a zirconocenium cation, which is a highly active olefin polymerization catalyst (Janiak, C. 2002. Metallocene Catalysts. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).