Categories: Accidental discoveries , Guest posts |  Comments
Guest post by Rowena Fletcher-Wood
Nobody had thought to study the orange sludge that was scraped off the Union Carbide pipes after manufacturing cyclopentadiene, but perhaps they should have done. When chemists eventually set their gaze on this colourful by product, the ensuing discovery of ferrocene catalysed a branch of research.
Organometallics had proved themselves a hard puzzle to crack, with only a handful developed by the 1950s, including the infamous Grignard reagents. Iron organometallics remained elusive, which is why Thomas Kealy and Peter Pauson, working at Duquesne University in 1951, had no intention of synthesising any. In fact, they were trying to make a totally organic compound: pentafulvalene, a molecule built from two cyclopentadiene rings fused together by a double bond. Samuel Miller, John Tebboth and John Tremaine, chemists at the British Oxygen Company, demonstrated no more interest in organometallics: their aim was to develop a new method of preparing amides from nitrogen and hydrocarbons, including cyclopentadiene. Both threw in iron catalysts – after all, iron was not going to form stable organometallic compounds, was it? (more…)