Organometallic uranium(iv) fluoride complexes: preparation using protonolysis chemistry and reactivity with trimethylsilyl reagents?

Dalton Transactions Pub Date: 2010-05-14 DOI: 10.1039/C001911A

Abstract

Reaction of the uranium alkyl complex (C5Me5)2UMe2 (1) with Et3N·3HF in toluene in the presence of a donor ligand (pyridine or trimethylphosphine oxide) results in gas evolution and the formation of the uranium(IV) difluoride complexes (C5Me5)2UF2(L) (L = NC5H5 (2), Me3P[double bond, length as m-dash]O (3)). Similarly, reaction of (C5Me5)2U[κ2-(C,N)-CH2Si(CH3)2N(SiMe3)] (5) with Et3N·3HF in toluene gives the uranium(IV) amide-fluoride complex (C5Me5)2U[N(SiMe3)2](F) (6). The fluoride complex (C5Me5)2UF2(NC5H5) (2) shows versatile reaction chemistry with a variety of trimethylsilyl reagents and demonstrates that the U–F bond provides an attractive synthetic strategy for accessing new functional groups that are not available from alkoxide or chloride complexes.

Graphical abstract: Organometallic uranium(iv) fluoride complexes: preparation using protonolysis chemistry and reactivity with trimethylsilyl reagents
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