After the discovery of ferrocene in 1951, Todd Reynolds and Geoffrey Wilkinson in 1956 synthesized the uranium metallocene Cp3UCl from sodium cyclopentadienide and uranium tetrachloride as a stable but extremely air-sensitive compound.
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In 1968, the group of Andrew Streitwieser prepared the stable but pyrophoric compound uranocene (COT)2U which has an atom of uranium sandwiched between two cyclooctatetraenide anions (D8h molecular symmetry).
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For example Henry Gilman attempted to synthesize compounds like tetramethyluranium and others worked on uranium metal carbonyls but none of the efforts met success due to organouranium instability.
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