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tightly bonded to uranium. In contrast to metal-carbon single bonds, where CC single bonds form during insertion reactions, insertion at the U=C double bond leads to a new unsaturated ligand.The reaction of 3 and C6HIINC (molar ratio 1 : 1, 1 h) in ether produces a red solution from which 4 can be isolated as red crystals in 53% yield after evaporation of the solvent followed by recrystallization from a 1 : 1 benzene-pentane mixture. The 'H-NMR spectrum shows paramagnetically shifted peaks [7], and the IR spectrum is complex, but does not exhibit a peak at ca. 2136 cm-', a characteristic frequency for C6HIINC ["I. 4 can be stored for months in vacuo or under anhydrous nitrogen, but decomposes within seconds if exposed to the atmosphere. It is very soluble in aromatic solvents and ethers, but only slightly soluble in aliphatic hydrocarbons.